Técnicas de união

501-25-60 Body Repairs - General Information 501-25-60 DESCRIPTION AND OPERATION Only in limited cases can welding errors in resistance spot weld joints be detected from the outside . Therefore, a test weld should be carried out before each repair weld. The peel test carried out after the welding gives information on the quality of the welding. The spot weld itself must never separate, it must tear away leaving a hole. MIG welding Basically, three methods of MIG welding are used: ‡ Puddle weld. ‡ Continuous bead welding ‡ Intermittent bead welding Fields of application ‡ Any joins that are MIG welded in production must also be replaced by MIG welds. ‡ Puddle welding may be used in certain cases, if there is insufficient access. ‡ If the overall panel thickness is greater than 3 mm, without correspondingly powerful spot welding equipment, puddle welding should be used. ‡ When dealing with any MIG brazed joints which are present, follow the vehicle-specific repair instructions. E113735 NOTE: The increased application of heat during MIG welding destroys the corrosion protection layers over a much larger area than during resistance spot welding. For this reason, greater care must be taken when applying the corrosion protection afterwards. Welding repairs can only be carried out properly if the equipment is set up correctly and all welding-related preparations are complied with accurately. ‡ Please note the instructions of the respective welding equipment manufacturer. ‡ The hose assembly must be untwisted. ‡ The core must be free from particles of wire debris. ‡ The gas and current nozzles must be free of slag and scale residue. ‡ Pay attention to the quality of the welding wire and the gas flow rate. ‡ Ensure that the joint surface is perfect. ‡ Prepare a bare metal joint surface. ‡ Maintain the correct gaps (root formation). ‡ Produce a test weld. Plug Weld