In case of TIG welding of aluminium alloys, the amount of shielding gas used can be determined from the band of white deposit (aluminium oxide) along side of the weld bea(d) A hairline width white band indicates that the quantum of shielding gas used has been
1. More than required
2. lesser than required
3. adequate as required
Which of the above is correct?
(a) 1 (b) 2 (c) 3
(d) Cannot be determined due to insufficient information