Toyota Tundra 2005 Service - Repair - Maintenance page 3518

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HIGH-STRENGTH STEEL (HSS) PARTS

Generally, High-Strength Steel (HSS) is that which has an intensity value of at 35 kgf/mm

The handling of HSS is the same as for mild steel, but the following should be observed.

Panel Hammering: Because HSS is thinner than mild steel, care should be taken to avoid warping during hammering

Removing Spot Welds: Because HSS is tougher than mild steel, damage will occur more easily to a regular drill. There-

fore, an HSS Spot Cutter is recommended.

Also, use a high-torque drill at low speed, and supply grinding oil to the drill use.

Panel Welding: Panel welding procedures for HSS are exactly the same as for mild steel. Plug welding should be done

with MIG (Metal Inert Gas) welder. Do not gas weld or braze panels at areas other than specified.

BODY PANEL CONSTRUCTION - High-Strength Steel Parts

(343 MPa), and distinguished from

: High Strength Sheet Steel