Joining Process – Welding | Interview Question and Answers

Joining Process – Welding | Interview , VIVA, Oral Question and Answers

1. What are the types of joints?

1. Permanent joint 2. Temporary joints

2. Give some example for permanent joints.

1. Riveted joint
2. Welded joint

3. Define – Welding.

Welding may be defined as the process of joining similar metals by the application of heat, with or without application of pressure and filler material.

4. What are the advantages of welding?

1. It produces permanent joints.
2. The overall cost of the welding equipment is very low.
3. A Large number of metals can be welded.
4. A good weld is as strong as base metal.

5. What are the types of welding process?

1. Pressure welding
2. Non-pressure welding

6. Give some example for pressure welding.

Spot welding, seam welding, lap and butt welding, projection welding.

7. Give some example for non – pressure welding.

1. Gas welding
2. Electric arc welding.

8. What is the principal of resistance welding?

The current is passes through the work pieces causes local heating and temperature rises to fusion point. Subsequent applications of pressure result in permanent joining of work pieces.

9. Give some example for resistance welding.

Spot welding, seam welding, butt welding, projection welding.

10. Give some example for gas welding.

1. Oxy acetylene welding
2. Oxy hydrogen welding
3. Oxy butane welding.

11. What are the types of flame used in gas welding?

1. Neutral flame
2. Oxidizing flame
3. Reduction flame.

12. What are the equipments used in gas welding?

Acetylene cylinder, gas cylinder, trolley, hose and hose fitting, pressure regulator, Welding torch.

13. List the technique used in gas welding.

1. Left ward welding. 2. Rightward welding.
3. Vertical welding 4. Overhead welding.

14. List the power sources used in arc welding.

1. AC machine 2. DC machine
3. Transformer 4. Transformer with DC rectifier

15. What is the use of flux?

To avoid the formation of oxide and get strong perfect weld. It takes away from the impurities present in the surface of metal.

16. Give some example for commonly used flux materials.

Borex, sodium chloride.

17. What is electrode?

Electrode made of metallic wire called core wire, coated uniformly protective coating called flux.

18. What are the types of electrode?

1. Bare electrode 2. Dust coated electrode

19. What are the types of welding rods?

Low carbon steel rod, mild steel rod, vanadium steel rod.

20. List the spot welding methods.

Direct, indirect, push pulls method.

21. What is seam welding?

It is the resistance welding process. The heat is produced due to resistance against current. It is also called stitch welding.

22. Define – Electro slag welding.

It is the welding process in which metal fused together by molten slag which melt the filler material and surface of the work to be welded.

23. What are the advantages of AC arc welding?

1. The transformer maintenance cost is less.
2. Efficiency is very high.
3. The power available is very less.

24. What is submerged arc welding?

The arc is produced between the electrode and the work piece. The arc, end of electrode, the molten pool is submerged in the molten pool.

25. What is the use of inert gases in TIG welding?

It is used to avoid atmospheric contamination of the weld pool. The gases used in the welding process are argon helium hydrogen.

26. What is the difference between TIG and MIG welding?

There is no filler material used in the MIG welding instead OF filler material some inert gases are used.

27. What are the equipments used in the TIG welding?

1. Electrode, filler material, FLUX
2. Welding power source
3. Inert gas cylinder
4. Pressure regulator.

28. What is the use of wire feed mechanism in MIG welding?

It is used to deliver electrode to the constant or varying speed.

29. List the types of arc used in the plasma arc welding?

1. Transferred arc
2. Non transferred arc.

30. What is Thermit welding?

It is the welding process employing chemical energy is used to produce high temperature.

31. What are the equipments used in Thermit welding?

1. Crucible
2. Mould
3. Supporting structure.

32. What is the principal of Electron beam welding?

The heat is generated from the kinetic energy of intense beam of high velocity electron.

33. What are the types of weld defects?

1. Dimensional defects – Warpage, incorrect joint preparation, size and profile.
2. Structural defects – porosity, non metallic inclusion, incomplete fusion, inadequate penetration.
3. Defective properties – low strength, toughness.

32. What is slag inclusion?

It is a defect in the welding process in which failure to remove the slag after each layer in a multilayer in the welding operation lead to slag inclusion.

33. What is the principle crack in the welding?

1. Hot cracking – It occurs at high temperature just below freezing point. Excessive sulpher and carbon content in promotes the cracking.
2. Cold cracking – It occurs at room temperature. It occurs due to change in volume at weld cool.

34. List the method involve in soldering.

1. Torch method
2. Furnace and hot plate method
3. Soldering iron method
4. Induction method.

35. What is soldering?

Soldering is the metal joining process with the help of the low melting point metal by the use of filler material and heat. The melting point of filler metal is below 427°C.

36. What is brazing?

Brazing may be defined as the technique of joining two similar or dissimilar materials by the addition of filler material whose melting point is above 427°C.

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