IN-12 INTRODUCTION PREPARATION FOR INSTALLATION SPOT WELD POINTS When welding panels with a combined thickness of over 3 mm (0.12 in.), use a MIG (Metal Inert Gas) welder for plug welding. HINT: spot welding will not provide sufficient durability for panels over 3 mm (0.12 in.) thick. Less than 3 mm APPLICATION OF WELD–THROUGH PRIMER (SPOT SEALER) Remove the paint from the portion of the new parts and body to be welded, and apply weld–through primer. HINT: See "ANTI–RUST TREATMENT" on page AR–2. WRONG Air Saw 20 – 30 mm Overlap Puncher ROUGH CUTTING OF JOINTS For joint areas, rough cut the new parts, leaving 20 – 30 mm (0.79 – 1.18 in.) overlap. MAKING HOLES FOR PLUG WELDING For areas where a spot welder cannot be used, use a puncher or drill to make holes for plug welding. REFERENCE: mm (in.) Thickness of welded portion | Size of plug hole 1.0 (0.04) under | 5 (0.20) φ over 1.0 (0.04) – 1.5 (0.06) | 6.5 (0.26) φ over 1.5 (0.06) over | 8 (0.31) φ over