Joining Metal

Question 1

What does tig and mig stand for

Answer 1

• Tungsten inert gas

* metal inert gas

Question 2

Why is flux used

Answer 2

It is used to prevent oxidisation when heat is applied and is used to keep surfaces clean

Question 3

How is the heat for tig and mig welding generated

Answer 3

Gases are mixed which can produce 3500 degrees which meets the two surfaces. In MIG welding a continuous wire electrode is fed through the torch. In TIG welding, non– consumable electrodes generate heat which then requires a separate rod to form the joint

Question 4

Why is a shield gas used and what is a common gas

Answer 4

A shield gas is used to prevent any oxidisation due to high temperatures and reaction with air ( Argon )

Question 5

What is an alternative name for hard soldering

Answer 5

Silver soldering

Question 6

Why can’t metal that has been painted be welded

Answer 6

Because paint is an insulator so it forms a seal which would wreck the weld and welding only works if it has a clean surface