question_answer ) Consider the following welding processes:

1. TIG welding

2. Submerged arc welding

3. Electro-slag welding

4. Thermit welding.

Which of these welding processes are used for welding thick pieces of metals?

A) 1, 2 and 3                     

B) 1, 2 and 4

C) 1, 3 and 4                     

D) 2, 3 and 4

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