Good Weld Bead Finish (W-10)

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GOOD WELD GOOD WELD BEAD FINISHBEAD FINISH

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BEAD FINISHBEAD FINISH

Aesthetic Appearance

Meets The Specified

Requirement ( If Any )

Defect Free Weld

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REQUIREMENT OF BEAD FINISHREQUIREMENT OF BEAD FINISH

Customer Audit Prior To Order Placement

Regular Customer Visit

Global Competition

Aesthetic Look

General Acceptance

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BEAD FINISH STANDARDBEAD FINISH STANDARD

Defense Requirement

UW-35 OF Div-I

(As per UW-35 OF Div-I

As welded surfaces are permitted,

however, the surface of welds

shall be sufficiently free from coarse

ripples, grooves,overlaps

and abrupt ridges and valleys.)

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HOW TO ACHIEVE HOW TO ACHIEVE GOOD BEAD FINISHGOOD BEAD FINISH

Welding Parameter.

Comfortable Position.

Lower Weaving.

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WELDING PROCESS & BEAD WELDING PROCESS & BEAD FINISHFINISH

SAW - Generally Good

SMAW - Depends On Welder Skill

SAW (T) - Single Wire Saw On Capping

Layer Gives Good Bead Finish

GTAW-Good

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BEAD FINISH AND WELD DEFECTBEAD FINISH AND WELD DEFECT

Undercut

Convexity And Concavity

Overlap

High Points In Restart Areas

Reentrant Angle

Inter-bead Valley

Slag And Porosity

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Uneven Bead Width And Bead Height

Spatter

Straightness Of Bead

Crater

BEAD FINISH AND WELD DEFECTBEAD FINISH AND WELD DEFECT

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BEAD FINISH AND GRINDING FOR BEAD FINISH AND GRINDING FOR

UT AND RTUT AND RT

When Grinding Is To Be Carried Out For

NDT Requirement,the Surface Shall

Smoothly Merge With The Parent Metal

Poor Bead Finish May Mislead The RT

Interpretation

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Description ofChecks

Acceptance Criteria

Not acceptable

Ref. Doc.

NTD.K.114 - 96 C1. 4.2, 6.2 & 6.4.

,pin holes

WELD BEAD REQUIREMENTSWELD BEAD REQUIREMENTS

1. Cracks in the seam and the nearby region and the nearby region, non - penetrations, burn through, pin holes, swellings, slag inclusions, spatters lumps of welds and Un-welded craters

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2. Porosity The weld seam is to be inspected for presence of pores. The following is not acceptable & to be repaired

(a) Separate pores with diameter greater than o.1t min. for T min <= 20mm and 2.0 mm for t min. >20mm.

(b) More than 3 pore in a length of 100mm with diameter less than 0.1tmin for t min <=20mm and less than 2mm

WELD BEAD WELD BEAD REQUIREMENTSREQUIREMENTS

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3.Size of weld joints

:Leg length of welds

Reinforcement and

width

Check the leg length

with the help of

maximum and minimum

templates prepared for

the purpose.Check the

reinforcement size and

width of the weld using

dimension limiting

templates and confirm

it as per drg.

NTD.K.114-96 C1.4.2

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4. Stray arcs and

arc strikes

Is not acceptable

and the affected area

repaired and

inspected using LPI

NTD.K.114-96 C1.4.2. & 6.2

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5. Undercuts in the main metal 0.5 to 1.0mm deep and more than 15mm long and undercuts with more than 1mm depth of any length is not acceptable The total length of individually accepted undercuts should not exceed 10% of the technologically independent seam.

NTD.K.114

96.C1.4.2 & .DND

letter no. SD/14103

Dtd .6/10/99 -

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6. Concavities & scales

Concavities and scales

more than 2mm shall be

fully repaired and re-

welded as required. The

concavities shall be

measured between the

peaks of the beads

NTD.K.114-

96.C1.4.2

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Weld Bead RequirementsWeld Bead Requirements

7. Bead overlap on

bead /parent metal

Inter bead valley shall not be more than that specified in table 1.

NTD.K.114 96.C1.6.2.

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Weld Bead RequirementsWeld Bead Requirements

8. Tungsten inclusion, oxidation tints ( in case of argon arc welding )

Not Acceptable. NTD.K.114- 96.C1.4.2,6.2 & 6.4

.

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9.Fairing of toe of weld to flange / shell surface

Prepare moulds from

weld joints/model joints,

which are acceptable or

check it manually. Fairing

of the toe of weld shall be

ensured visually. Working

protocol 4098-02 dtd.

8/990

NTD.K.114- 96.C1.6.2

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10. Broken sections/ hot take always while removal of temporary attachment.

Not Acceptable SD/141006.C1.1.6.19

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11. Presence of

annealing bead

The presence of annealing

bead is to be checked.

The annealing bead

should not touch the

parent metal.Fig.3 &3A

SD/141006 C1.2.2.9.

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Documents

Good Weld Bead Finish (W-10)