55) What should be the pre - heating temperature of aluminium job for gas welding?

200 Degree Centigrade - 400 Degree Centigrade

250 Degree Centigrade - 400 Degree Centigrade

300 Degree Centigrade - 400 Degree Centigrade

350 Degree Centigrade - 400 Degree Centigrade

Answer is:

250 Degree Centigrade - 400 Degree Centigrade

Groove angle

Welding position

Diameter of pipe

Pipe wall thickness

Answer is:

Answer is:

Rotate pipe and weld vertically

Pipe not rotated weld verticality

Pipe not rotated and pipe axis 450

Pipe welded 12'o clock to 6'o clock downhill

Answer is:

Dia 1.6 mm

Dia 3.0 mm

Dia 3.5 mm

Dia 4.0 mm

Answer is: