Toyota Collision Repair Information - Welding High Strength Steel (H.S.S.).pdf
Taken from 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.

