PRESENTED BYILAMVAZHUTHI.C

1

Under the guidance of Mr.S.CHOKALINGAM M.E

(Assistant professor)

DEPARTMENT OF MECHANICAL ENGINEERING E.G.S.PILLAY ENGINEERING

COLLEGENAGAPATTINAN

Optimization of MIG and TIG Welding

Parameter To Increase The Tensile Strength

in HAZ Using Various Destructive ,Non

destructive test and Finet element analysis.

In this competitive world, the customers perceive the most reliable high quality with low cost product. In order to satisfy the customers demand, the manufacturing industries are being forced to continuously optimize their process parameters. Gas metal arc welding famously abbreviated MIG and TIG is one of the most important metals joining process in manufacturing industries. The selection of improper MIG and TIG process parameter increases the power consumption, material consumption, man power and cost of the product decreasing the weld quality. Here in our project we are done a experiment with pure TIG welding for a root and MIG welding for run to perform experiment

This project work is part of program for the development of new EN8 and OHNS steels to increase mechanical properties and minimization of metallurgical defects to increasing weldment. The quality of weld in MIG and TIG mainly influenced by independent variables such as welding current, speed of electrode and electrode stick out. The prediction of process involved in MIG and TIG is a very complex. NDT and DT can performed in this research

Welding may be defined as the process of joining similar or dissimilar metals by the application of heat with or without addition of filter metal in such a way that the result is continuity of homogeneous material.

The customers perceive the most reliable high quality with low cost product

The selection of improper MIG and TIG process parameter increases the power consumption, material consumption, man power and cost of the product.

In this project we will be made many attempts for made test pieces to predict parameter of MIG for getting maximum surface finish, tensile strength and min HAZ

Arc welding , Gas welding, Resistance welding, Thermit welding

Arc welding Carbon arc Metal Arc MIG TIG Atomic hydrogen Plasma Arc Submerged Arc

In this type of arc welding the consumable electrode is supplied continuously. The electrode is vied as filler metal and to product arc when DC supply is given, an electric arc is produced between the consumable electrode and the work piece. An inert gas like argon or helium is passed at the welding place through nozzle. The inert gas products a gas shield around the electric arc. This prevents the molten metal to react with atmospheric air. The edges of the work piece are melted by the electric arc and joined together to give weld.

Aluminium, Stain less steel, magnesium and nickel alloys can be welded by this method

Advantages

No flux is needed Welding speed is high Quality welding joint can be obtained

This method is similar to MIG welding Non-Consumable tungsten electrode is used. It produces only electric arc. It can not be used as filler metal. The tungsten electrode is fixed in an electrode holder. When power supply is given an electric arc is produced between the tungsten electrode and the work piece. An inert gas like argon (or) helium is passed at the welding place through a nozzle. The inert gas produces a gas shield around the electric arc. The edges of work pieces are melted by the electric arc and joined together to give weld. The electrode will not be melted during welding.

Aluminium, cast iron, steel and magnesium can be welded by this method

Welding sheet metal and thinner sections Aircraft, chemical and instrument

industries Rocket motor chemical and instrument industries Rocket motor chamber fabrications in launch vehicles.

MIG Welding Machine Size of Filler Rod : 2mm Filler Rod Material : Copper Coated Mild

Steel TIG Welding Machine: Amps : 20 -300-AT/TIG Tig : 16 Amps /415v Cooling : Air cooling Frequency : 50Hz

EN8 – Unalloyed medium carbon steel OHNS – Oil harden Non shrinking steel

Typical Analysis

EN8 : C Si mn s p0.40% 0.25% 0.80%

0.015% 0.015%OHNS : C Si mn s p 0.40% 0.25% 0.70% 1.20% 0.30%

Destructive Testing Non Destructive Testing

Non-Destructive Testing Visual testing Penetrant Testing Electro Magnetic Testing Ultrasonic Testing Radiography Testing

Rockwell Hardware Test Before Welding

EN8 - 25(average value) OHNS - 16(average value)

Radio Graph No

V 17.5 / A 129

V 20.2 / A 183

V 25.0 / A 257

Material : EN8&OHNS