Question

For a particular condition if the welding speed decreases, then:
Arc blow increases
Deflection of arc decreases
Deflection of arc increases
Arc blow decreases

Answer 1

Answer:

As it is likely to be easier to control a backward deflecting arc than a forward deflecting one during MMA welding, it is usually better to weld towards the return or earth connections. Use of multiple earth connections may solve the problem altogether. Use alternating current (AC) rather than DC for the root run.

Explanation:

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Answer 2

If the welding speed decreases Arc blow decreases

• The bead size and the welding speed are inversely proportional to each other; Now when the welding speed increases we need to keep the arc voltage low to prevent the risk of arc blow.

• And for very low welding speeds another risk is there of burn through; and with the combination of High arc voltage and very low welding speed; mushroom shaped beads are produced; this can have solidification cracks at sides. and for so much low speed of welding too much of weld deposit could be there and can increase the chance of cold lap

• different electromagnetic fields interaction near welding arc causes arc blow .

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