Which of the following process can be used for welding of

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Which of the following process can be used for welding of Aluminum alloys?
P. Submerged arc welding
Q. Gas metal arc welding
R. Electroslag welding
S. Gas tungsten arc welding

1. P and Q
2. Q and S
3. Q and R
4. R and S

Correct Option: B

To remove the ceramic layer of aluminium oxide, TIG is used.