Volvo C30 2007 Service And Repair Manual page 91

RESISTANCE SPOT WELDING
Resistance spot welding must primarily be used if the capacity of the welding equipment is matched to panel
thickness. When carrying out resistance spot welding, grind down to bare metal.
Clean the surfaces with Scotch-Brite or similar to minimize zinc and phosphating damage. Apply welding
primer between the panels.
NOTE: Always test weld in accordance with the method below. Always set the weld
according to panel quality
MAG WELDING
Punch replacement part for plug welding.
Select size of hole for plug welding according to the following panel thicknesses:
8 mm for thicknesses less than 2.5 mm
10 mm or more for thicknesses above 2.5 mm.
Fig. 17: Identifying Welding Lens Diameter
Courtesy of VOLVO CARS CORPORATION
Test weld several test pieces. Break the panels apart and measure the size of the welding lens diameter (A), see
illustration.
2012 Volvo C30 T-5
ACCESSORIES AND BODY, CAB Body Frame - General Information