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Spot Welding Lab Report

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2.4 SPOT WELDING
2.4.1 Principle of Spot Welding
Resistive spot welding is a course of during which contacting metallic surfaces are joined by the heat obtained from resistance to electrical present. Work-items are held collectively under strain exerted by electrodes. In general the sheets available are in the range of 0.5 to 3 mm thickness. The strategy makes use of two shaped copper alloy electrodes to pay attention welding present right into a small "spot" and to concurrently clamp the sheets collectively. Forcing a giant present by the spot will melt the metallic and kind the weld. The engaging operate of spot welding is that a number of energy could also be delivered to the spot in a really quick time.
The quantity of heat delivered to …show more content…

High frequency welding current has a better focus on the connection point, that allows the usage of significantly lower welding currents. Ability to control the wave form of the weld current and pulsation.
2.4.3 Spot welding process stage-wise (sequence)
Spot Welding Stage - 1
A. Spot Welding Stage - 1 , Sequence - 1 :
• Top Frame / Outer Skin
B. Spot Welding Stage - 1 , Sequence - 2 :
• Bottom Frame / Outer Skin.
C. Spot Welding Stage - 2 , Sequence - 3 :
• Front pillar with outer skin.
• Rear pillar with outer skin.
Spot Welding Stage - 2
D. Spot Welding Stage - 2 , Sequence - 1 :
• Spot Weld between inner skin and outer skin.
• Spot Weld between Pillar and inner skin of the door.
E. Spot Welding Stage - 2 , Sequence - 2 :
• Spot Weld between inner skin and bottom frame.
• Spot Weld between inner skin and top frame. 2.4.4 Phases in Spot Welding  Phase 1 :
Electrodes press the welded work pieces. The electrode force decreases the transfer resistance of work pieces at that point, directing welding current through the desired

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