GATE ME 2014 Set 3 — Question 65
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Manufacturing Processes → Joining → Welding Processes
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Question
For spot welding of two steel sheets (base metal) each of 3 mm thickness, welding current of 10000 A is applied for 0.2 s. The heat dissipated to the base metal is 1000 J. Assuming that the heat required for melting 1 mm volume of steel is 20 J and interfacial contact resistance between sheets is 0.0002 , the volume (in mm) of weld nugget is _______
Correct answer
140 to 160
Solution
Step 1: Calculate the total heat generated () at the interface using Joule's law of heating.
Given:
A
s
JStep 2: Calculate the heat available for melting () by subtracting the heat dissipated to the base metal ().
Given J
JStep 3: Calculate the volume of the weld nugget () using the heat required for melting per unit volume ().
Given J/mm
mmThe volume of the weld nugget is 150 mm.
Given:
A
s
JStep 2: Calculate the heat available for melting () by subtracting the heat dissipated to the base metal ().
Given J
JStep 3: Calculate the volume of the weld nugget () using the heat required for melting per unit volume ().
Given J/mm
mmThe volume of the weld nugget is 150 mm.
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