Short Description
In today’s body shop environment high strength steel (H.S.S.) body parts are frequently welded during collision damage repairs. Typical uses for H.S.S. are the front cross member, front body outer pillar, floor side member and door side impact protection beam. Because H.S.S. is used in these areas of potential high stress, repairs must be done properly to maintain the structural integrity of the vehicle.
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Content
Two types of H.S.S. are used. Solution hardened H.S.S. is used for door panels, hood outer panel, etc., while precipitation hardened H.S.S. is used for door impact beams and bumper reinforcements. It is not necessary to distinguish solid solution hardened steel from ordinary steels for repair purposes.
REPAIR GUIDELINES
H.S.S. and ordinary steel parts in Toyota vehicles are welded using the same methods. The following precautions apply:
- Use either spot welding or MIG/MAG (shield gas) welding. MIG/MAG (shield gas) welding should only be done by an experienced body shop person.
- Only braze body components previously brazed at the factory and as indicated in the Toyota Repair Manual for Collision Damage.
- Do not use an oxy–acetylene torch for fusion welding auto bodies. The large heat affected zone may destroy galvanized coatings and cause excessive panel distortions. In addition, an oxy–acetylene torch will reduce the strength and increase the brittleness of H.S.S.
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