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PANEL REPAIRS PROCEDURES 77-2-13 PROCEDURES General welding precautions General The replacement welds in the welding diagrams are denoted by the following symbols: a = Single/Multiple thickness plug welds b = MIG seam weld When NOT carrying out welding operations the following criteria must be observed: l Where resistance spot welds have been used in production, these must be reproduced with new spot welds in l When spot welding, it is recommended that test coupons of the same metal gauges and materials are produced l The electrode arms on hand-held spot welding guns must not exceed 300 mm (11.811 in) in length; l Single-side spot welding is not acceptable; l Brazing and gas welding are not acceptable EXCEPT where they have been specified in production; l Where 3 metal thicknesses or more are to be welded together it is imperative to use MIG plug welds to ensure l MIG plug welds must be used in repair joints where there is no access for a resistance spot welder. To replace l Where holes are left in an existing panel after removal of the spot welds, a single MIG plug weld will be made in Seat belt anchorages Where possible, the original production assembly should be used, complete with its seat belt anchorages, or the cut All welds within 250 mm (9.842 in) of seat belt anchorages must be carefully checked for weld quality, including |