AUGUST 2019 VOL 1.

Quarterly Newsletter of Indian Society for Non Destructive Testing

MUMBAI CHAPTER

Dear Members,

Very excited with the launch of ‘NDT-Connect’, Newsletter of ISNT Mumbai Chapter. NDE

2018, Conference & Exhibition at Mumbai, was a big success as it created a new

benchmark in terms of number of delegates, technical papers and participation from

industries and exhibitors. Such events not only play a crucial role in networking but also in

bridging the gap between the technological innovations and their applications in

industries.

Continuing with the momentum, ISNT Mumbai Chapter has embarked on an ambitious

programme wherein it is planning to conduct technical lectures, training & certification

courses and symposiums on a regular basis for the benefit of its members. Your

participation is vital to the success of these events. This Newsletter will provide a powerful

medium to bring things together for interaction.

I wish the editorial team of ‘NDT-Connect’ a total success in connecting us.

CHAIRMAN’S NOTE

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www.isnt.org

Here we are with the debutant quarterly Newsletter of ISNT Mumbai Chapter,

“NDT Connect”.

What sets this newsletter apart is the coverage of not just the past & upcoming event

updates, but the intriguing article for the NDT geeks, a section honoring NDT

professionals’ for specific milestones achieved, ISNT Mumbai Committee list & a run

through the various functions of Working Groups of Mumbai Chapter, thus connecting the

readers to NDT fraternity.

I thank the Mumbai Chapter Executive Committee for their suggestions & the Editorial

Team for their contribution for this Newsletter.

It is our hope that this newsletter connects & brings you back for engrossed reading.

Share your wish list, comments, will try to fulfill them.

Stay Connected!

Shri Rajul ParikhChairman,

Working Group NewsletterVice Chairman, ISNT Mumbai

Dr. Paritosh Nanekar Chairman,

ISNT Mumbai

MANAGING EDITOR'S NOTE

(ISNT) Indian Society for Non Destructive Testing’s website has a new address. Login to www.isnt.in for latest updates on Memberships, Certificate Courses/ Exam schedule, Evening Lectures, Downloads - ISNT Publications, E-Certificates, Awards Information, Event updates & lot more.

PT Level II course was conducted at NPCIL from 24th to 27th June 2019 followed by an examination on 28 th June 2019. Course coordinater was Mr. Amar Pathare and faculties were Mr. Amar Pathare and Mr Luke Pimenta . Examiner was Mr. N. Sadasivan.VT level II course was conducted at NPCIL from 1st July to 4th July 2019 followed by an examination on 5th July 2019. Course coordinater was Mr. Amar Pathare and faculties were Mr. L. M. Tolani and Mr. Amar Pathare. Examiner was Mr. Luke Pimenta. 19 candidates attended.

ISNT congratulates Mr.Sunil Suri & NDT team from L&T for completing the realisation of S200 Head End Segment (HES-06-LT) in the record time by setting a new benchmark & for completing the proof pressure testing (PPT) and delivering the segment as per VSSC requirement for Chandrayan-II mission. Their achievement was acknowledged by a letter of appreciation from ISRO.

ISNT extends a warm welcome to the new Life Members : Mr. Subodh Kumar, Mr. Vikas Govil and Mr. Madhusudan Behera and Life Corporate Member Electronics Devices World Wide Pvt. Ltd.

Shri L.M.Tolani’s 80th Milestone birthday was celebrated on 29th June, 2019 at Khar Gykhana’s Presidential Banquet Hall with his family, close relatives & friends. The evening witnessed some enthusiastic performances by his grandchildren and few words from near & dear ones. On behalf of all ISNT members, veteran Shri P.G.Kulkarni bestowed Tolaniji with a commemorative plaque for his dedicated service to NDT & ISNT, educating & training generations of competent NDT professionals with utmost passion and zest. Everyone was delighted to be at the fun filled musical evening & relished the spread of scrumptious food. Tolani family thanked everyone for their presence with a pleasing gesture of gift.

LOOKING BACK

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ISNT Mumbai Symposium & Exhibition to be conducted on 27th September 2019 from 2:30 to 5:30 pm at Crystal Banquets, Acres Club, Chembur (E), Mumbai.

ISNT Mumbai Chapter AGM on 27th September 2019, 6:00 pm onwards at Crystal Banquets, Acres Club, Chembur (E), Mumbai, followed by dinner.

ISNT’s most anticipated yearly event, ‘NDE 2019’ to be held from 5th to 7th December 2019 at Bengaluru, Clarks Exotica Resort & Spa. For more details visit www.nde2019.in

Shri Rajul Parikh with the young man Shri P.G.Kulkarni reading the citations ISNT Mumbai team

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LOOKING FORWARD

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1.0 INTRODUCTION

Ultrasonic testing is widely used for detection and characterization of flaws in the components during manufacturing stage as well as while they are in service. Apart from flaw detection, ultrasonic testing is also useful for characterization of material properties. The fundamental basis behind this is the fact that the propagation of sound beam inside the material is significantly affected by changes in material’s microstructure and since the material’s microstructure affects properties of materials, these can be monitored or assessed by ultrasonic testing. There are two useful ultrasonic parameters, which are widely used for material characterization: sound velocity and sound attenuation. The speed of sound in a homogenous medium is directly related to the elastic modulus, poison’s ratio and density. Hence, any change in elastic properties due to microstructural changes, such as presence of micro-cracks, fissures, inclusions etc. affects the sound velocity in the material. Sound attenuation refers to the loss in the sound energy as it passes through the material. The two important mechanisms of sound attenuation are scattering and absorption. Since both these factors are affected by the material’s microstructure, ultrasonic techniques based on attenuation measurement are widely used for characterization of material properties such as grain size, inclusion rating, presence of micro-cracks etc. [1]. One of the major drawbacks in the application of the techniques based on sound velocity and attenuation measurement for characterization of material properties is that both these parameters require the knowledge of actual thickness of the component, where these measurements are being made. While this information is easily available at the manufacturing stage, during service life of the component, the actual thickness at the location where measurements are being made is difficult and sometimes impossible to determine. As a result, these parameters are seldom employed for material characterization during in-situ applications. A novel approach based on ultrasonic velocity ratio measurement overcomes this limitation. Ultrasonic velocity ratio refers to a parameter determined by taking the ratio of sound velocity in longitudinal and shear modes (or vice-versa). The velocity ratio is independent of the thickness and does not need the information on the thickness of the component, where measurements are made. As a result, this parameter is very useful for monitoring in-situ degradation in material properties, which the component may undergo while it is in service. This paper describes the methodology for determination of sound velocity ratio in materials and how this parameter can be effectively used for monitoring early degradation in components. A case study where velocity ratio has been used to assess the depth of intergranular corrosion (IGC) attack in stainless steel has been briefly described.

2.0 ULTRASONIC VELOCITY RATIO MEASUREMENT

The most convenient way to determine the ultrasonic velocity ratio at any given location in the component is by using normal beam transducer emitting longitudinal waves. When the normal beam transducer is kept on a sample, one would obtain a series of backwall echo signals at metal paths corresponding to the thickness and its multiples. The backwall echoes show a gradual decrease in the amplitude due to the sound attenuation. The time of flight difference between the two backwalls is a measure of sound velocity in the material. If the amplifier gain is increased, one can observe small amplitude signals between first and second backwall, second and third backwall and so on. A typical A-scan at higher amplifier gain when a normal beam probe is kept on a sample is shown in Figure 1. The first signal in the A-scan (on the left) is the initial pulse or the front surface signal. The second signal in the A-scan, denoted as FBE, is the first backwall echo. For this signal, the sound beam has travelled in the longitudinal mode during its forward path (front surface to back surface) and the return path (back surface to front surface). The last signal in the A-scan, denoted as SBE, is the second backwall echo. For this signal, the sound beam has travelled twice between the front surface and the backwall in the longitudinal mode. In between FBE and SBE signals, a small amplitude signal, denoted as SE, is seen. This signal is the mode converted backwall echo. For this signal, the sound beam has travelled in the longitudinal mode in the forward path. At the backwall, small fraction of sound beam undergoes mode conversion and returns to the front surface as shear wave. In effect, for the SE signal, the sound beam travels in longitudinal mode during the forward path and shear mode during the return path.

ULTRASONIC VELOCITY RATIO: USEFUL PARAMETER FOR MONITORING MATERIAL PROPERTIES

N Jothilakshmi and Paritosh Nanekar

Quality Assurance Division, Bhabha Atomic Research Centre, Mumbai

E-mail: jothin@barc.gov.in

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From the A-scan, one can easily determine the metal path (or time of flight) of FBE and SE signals. Let these be x₁ mm (or seconds) and x₂ mm (seconds) respectively. In such case, the velocity ratio (longitudinal to shear mode V /V ) is given by:L T

where, V is sound velocity in longitudinal mode, V is sound velocity in L T

shear mode, x₁ is the metal path for FBE signal & x₂ is the metal path for SE signal.Any change in material microstructure (and so the property), changes the velocity of sound in longitudinal and shear modes. The magnitude (or sometimes the direction) of this change is different for these two modes. As a result, the velocity ratio changes when there is a change in the material property. This forms the basis for material characterization based on sound velocity ratio.

3.0 IN-SITU MONITORING OF INTERGRANULAR CORROSION (IGC) USING VELOCITY RATIO TECHNIQUE

Austenitic stainless steels are resistance to uniform corrosion due to presence of continuous chromium oxide layer but they are to prone localized corrosion attack. When the sensitized austenitic stainless steel is exposed to corrosive medium, they undergo localized corrosion attack called Intergranular Corrosion (IGC). The conventional ultrasonic testing based on sound beam reflection cannot identify the presence of IGC attack in the material. However, the technique based on measuring ultrasonic parameter such as ultrasonic velocity, velocity ratio and attenuation can be used for the detection and characterization of IGC in the austenitic stainless steels [2]. To establish the in-situ monitoring

technique based on ultrasonic velocity ratio measurement, samples with varying degrees of IGC attack were generated in the laboratory according to ASTM A262, Practice C. To simulate the actual plant condition, the corrosion attack on one side of the surface was removed by machining and the samples were subjected to ultrasonic velocity ratio measurement. The sound velocity in a medium is directly related to elastic modulus and density. The IGC attack produces numerous attacked regions at (sensitized) grain boundaries that are akin to micro-cracks in the sample, and this reduces the elastic modulus of the material in the attacked region. Figure 2 shows the variation in longitudinal to shear velocity ratio (V /V ) L T

with the depth of IGC attack. The ratio decreases with increasing depth of IGC attack. The decrease in ultrasonic velocity ratio indicates that longitudinal velocity is more affected by IGC attack than the shear velocity. Since the velocity ratio is independent of thickness, this approach can be used for the in-situ measurement of IGC attack in pipes and vessels. From

Figure 2, one can estimate the depth of IGC attack at an unknown location by determining the velocity ratio.

4.0 CONCLUSION

Ultrasonic velocity ratio is a very useful parameter for characterization of material properties. Since the time-of-flight of ultrasonic signals can be measured very accurately with the help of advanced instruments, ultrasonic velocity ratio can be determined with very high precision. As a result, one can monitor very small changes in material properties. Velocity ratio can thus serve as a very useful parameter during quality control at manufacturing stage (for example, qualifying the heat treatment) and for detection of damage in the material at an early stage during service.

References:

1. ‘Characterization of Material Properties by Ultrasonics’, PP Nanekar and BK Shah, BARC Newsletter, Issue No: 249, 25-38.2. ‘Assessment of Intergranular Corrosion Attack in Austenitic Stainless Steel using Ultrasonic Measurements’, N. Jothilakshmi, PP Nanekar and V Kain, Corrosion Science, Vol 69, No 4, 388-395, April 2013.

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EVENT HIGHLIGHTS

Largest gathering of NDT professionals in the country.

Pre conference tutorials will be on December 3-4, 2019 on topics:

PCT 1 : Thermal imaging- Industrial and Medical applications; PCT 2 : 3D X-ray imaging –

Applications in Additive manufacturing, Process quality control and Metrology;

PCT 3 : NDE during Aircraft manufacturing and In-service; PCT 4 : NDE of Civil Structures

Keynote lectures by eminent speakers from all over the world.

Engrossing technical sessions on conventional and advanced NDT technologies.

Industry specific sessions on the application of NDT technologies.

Exhibition showcasing state of the art NDT equipments, technologies and services.

Abstract submission deadline is 15 September 2019.

Author registration deadline is 30 October 2019.

Multiple sponsorship opportunities for NDT equipment manufacturers and service

providers.

BENEFITS

Listen, interact and learn from some of the best minds in the field of NDT

Opportunity to present the work in front of peers

Industry specific sessions highlighting inspection challenges and solutions

Witness latest NDT technologies for industries and research at the exhibition

Certificate of attendance, which can be used for renewal of NDT Level III certificates

Platform to showcase products in front of the biggest gathering of NDT professionals

Opportunity to launch new products or technologies

Networking opportunity with professionals from various industries

Contact: info@nde2019.in; www.nde2019.in

For Delegates

For Sponsors & Exhibitors

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Conference and Exhibition on

Non-Destructive

Evaluation

organised by

Indian Society for Non Destructive Testing(ISNT)

venueClarks Exotica ConventionResorts & Spa, Bengaluru, INDIA

theme

e avours fromNDEdetection to prediction

70+Exhibitors

800+Delegates

200+Presentations

30+ Keynote Speakers

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ISNT-Mumbai Chapter invites nominations for “NDT Achievement Awards 2019”. Awards will be presented during AGM. Award winner is requested to make a brief presentation of their work. Details and guidelines for the awards are as follows:-Title : ISNT Mumbai Chapter NDT Achievement Awards.Purpose : To honour individual NDT professionals who have made significant contribution in the field of NDT.Eligibility : Applicant or his sponsoring organization should be members of ISNT Mumbai Chapter at least for 2 yrsCategory : 1. Research & Development in NDT 2. Industrial Applications In NDT, 3. NDT Training & Education, 4. Young NDT Professional and 5. Industrial NDT Services.Nomination : Any organization or person including self can nominate for the award.Selection : Working Group-Awards constituted by EC will review all the award applications and select the awardees in each

category .

NDT ACHIEVEMENT AWARDS 2019

Schedule Course Duration Course No

September 2019 Level - I 23/09/2019 to 28/09/2019 2019-I-09

November 2019 Level - I 11/11/2019 to 16/11/2019 2019-I-11

December 2019 Level - II 16/12/2019 to 21/12/2019 2019-II-12

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UT TRAINING COURSES

NOTE: - Faculty Shri Ashok Trivedi - B.E. (Metallurgy), ASNT NDT Level III (ET, MT, PT, RT, UT)- Sponsorship by way of exemption in full or partial of the course fee, for financially indigent candidate via Late Shri Rameshbhai Parikh Memorial Fund (Founder-EEC Group), are considered.

For Nomination Forms contact : Samir K. Choksi (Hon. Secretary-ISNT Mumbai Chapter)Tel. 022- 2832 7521; E-mail: isntmumbai@gmail.com/offc@isnt.org; Website : www.isnt.in CATEGORY &

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OFFICE ADDRESS

ISNT MUMBAI CHAPTER EXECUTIVE COMMITTEE

Paritosh Nanekar (Chairman)+91 989 216 1750paritoshn@yahoo.com

Rajul Parikh (Vice Chairman)+91 982 019 2953rajulparikh@eecindia.com

Mukesh Arora (Vice Chairman)+91 932 173 0516mukesh@ndts.co.in

Samir K. Choksi (Hon. Secretary)+91 982 101 1113choksiindia@yahoo.co.in

Krishna Bhuta (Hon. Jt. Secretary)+91 982 002 9375krishna.bhuta@topaxndtsolutions.com

Niranjan Sthalekar (Hon. Jt. Secretary)+91 986 964 2505sthalekarniranjan@gmail.com

Anil. V. Jain (Treasurer)+91 982 094 0456anilj15@gmail.com

D.J.Varde

N.V.Wagle

R.S.Vaghasiya

Dilip Takbhate

K.B.Sharma (Jetly)

B.K.Shah

Hemant Madhukar

A.J.Trivedi

N. Sadasivan

S.N.Roy

Arbind Kumar

Amar Pathare

Sameer Mhatre

Sunil Kumar Suri

Manish Gutka

Rajesh Gandhi

A.k.Singh

A.K.Sharma

Sunil Mukul

Tushar Mukherjee

Mahesh B. Jadhav

Niraj Kumar

CHAIRMAN

NEWSLETTER EDITORIAL TEAM

Mr. Rajul Parikh Mr. Mukesh Arora

Mr. M.B.Jadhav

Mr. Krishna Bhuta

Mr. Hemant Madhukar

Mr. Niranjan SthalekarMs. Rachna Jhaveri

CONTENT TEAM

DESIGN & COMPILATION

MEMBERS

SR. WORKING GROUP COMPOSITION RESPONSIBILITIES

WG-1Training &

Certification

LM Tolani - Chairman N Sadasivan - Co-Chairman RS Vagasiya, Amar Pathare

Ashok Trivedi, Rajesh Gandhi, Arbind Kumar

Organize at least 6-8 certification courses and if possible, 2-3 non certification courses in a year, Prepare and update list of faculty for various techniques and subjects, Procure and maintain test samples for Practical Training, Prepare and submit quotation for training programmes, Identify and Appoint Course Director, who in turn will choose the faculty.

WG-2Technical

Programmes

NV Wagle - ChairmanMB Jadhav, Arbind Kumar, Sunil MukulAK Sharma- Representative from AERB

Organize at least 3 technical programmes in a year, Identify the Speaker and coordinate with him/her for the suitable date/time, Identify the venue and prepare the cost estimate, Preparing the announcement/email for communicating to ISNT Members/Invitees.

WG-3Industry

Relationship

Tushar Mukherjee and Umakanthan Anand - Chairmen

Rajul Parikh, Anil Jain, Mukesh AroraAK Sharma, Sunil Suri

Representative from Boiler Board

Organize at least two ISNT-Industry Meet in a year. Prepare the agenda for the Meeting, Coordination with Industry representatives for their participation in ISNT-Industry, Meeting Coordination with industry for participation in ISNT Mumbai Chapter Activities (Training courses, technical talks, technical programmes etc.)

WG-4Interaction with

Educational Institutions

DJ Varde-ChairmanKB Jetly, SN Roy, Krishna Bhuta

Organize NDT Awareness programmes at Educational Institutions in and around Mumbai

WG-5Marketing & Membership

Mukesh Arora - Chairman, Niraj Kumar - Co Chairman,

SN Roy, Samir Choksi, Rajesh Gandhi, P Gopal

Design, Print & Circulate brochures on Mumbai Chapter Activities, Design e-mailers for Technical Programmes, Training Courses, Events, Reach out to Industries, Government and Public Sector Units for Membership, Corporate and Student Members, Interfacing with other technical societies (NANSO, IIW, ASM, NACE etc.)

WG-6 NewsletterRajul Parikh - Chairman,

Krishna Bhuta, Hemant Madhukar, MB JadhavBring out ISNT-Mumbai e-Newsletter once in three months, Get inputs from all the working groups for the newsletter

WG-7 AwardsBK Shah - Chairman

AK Singh, N Sadasivan, Arbind Kumar

Prepare the format of application forms for Awards under various categories, Evaluate the Award application forms and select the award winner

WG-8 WebsiteSamir Choksi - Chairman

Mukesh Arora, Niranjan Sthalekar Design & maintain ISNT Mumbai website

WG-9 EventsSamir Choksi - Chairman

Manish G., Sameer M., Niranjan S.Plan for EC meetings, AGM and one/two-day conference & exhibition, Finalize the dates and venue, Prepare the budget

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ADVISORY COMMITTEE

P.G.Kulkarni

L.M.Tolani

Dr. Dara E.Rupa

P. Gopal

V.J.Thaker

P.R.Parikh

A.C.Jaju