GATE ME 2017 Set 1 — Question 23
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Manufacturing Processes → Joining → Welding Processes
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Question
In an arc welding process, welding speed is doubled. Assuming all other process parameters to be constant, the cross sectional area of the weld bead will
Correct answer
(D) reduce by 50%
Solution
In an arc welding process, the volume of weld metal deposited per unit time () is constant if the wire feed rate and other deposition parameters are constant. The volume of weld metal deposited can also be expressed as the product of the cross-sectional area of the weld bead () and the welding speed ().So, If the welding speed () is doubled, let the new speed be . To maintain a constant volume of weld metal deposited per unit time (), the cross-sectional area of the weld bead () must adjust.
This means the new cross-sectional area () will be half of the original cross-sectional area (). A reduction to half implies a 50% reduction.Therefore, the cross-sectional area of the weld bead will reduce by 50%.
This means the new cross-sectional area () will be half of the original cross-sectional area (). A reduction to half implies a 50% reduction.Therefore, the cross-sectional area of the weld bead will reduce by 50%.
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