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REPAIRING HIGH STRENGTH STEEL BRM-53 < REMOVAL AND INSTALLATION > C D E F G H I J L M A B BRM N O P • When welding HSS panels, use spot welding whenever possi- ble in order to minimize weakening surrounding areas due to heat. If spot welding is impossible, use M.I.G. welding. Do not use gas (torch) welding because it is inferior in welding strength. • The spot weld on HSS panels is harder than that of an ordi- nary steel panel. Therefore, when cutting spot welds on a HSS panel, use a low speed high torque drill (1,000 to 1,200 rpm) to increase drill bit durability and facilitate the operation. • SP150 HSS panels with a tensile strength of 785 to 981 N/ mm 2 (80 to 100 kg/mm 2 , 114 to 142 klb/sq in), used as rein- forcement in the door guard beams, is too strong to repair. When these HSS parts are damaged, the outer panels also sustain substantial damage; therefore, the assembly parts must be replaced. 2. Precautions in spot welding HSS This work should be performed under standard working condi- tions. Always note the following when spot welding HSS: • The electrode tip diameter must be sized properly according to the metal thickness. • The panel surfaces must fit flush to each other, leaving no gaps. PIIA0144E PIIA0145E PIIA0146E PIIA0147E |