Repair Overview - High Strength Steel Sheet Welding Overview
1. High Strength Steel Sheet Welding Overview

Welding

Spot welding is the recommended and preferred procedure for the welding for high-strength steel parts same as for a mild steel plate welding. In areas that cannot be accessed by a spot welder, perform MAG welding as specified in the Replacement procedures.

Tensile strength and welding method
Tensile Strength
(MPa)
Welding Method
Spot welding
MAG Weld
Plug
Butt
270
?
?
?
340
?
?
?
440
?
?
?
590
?
?
?
780
?
?
?
980
?
?
×
1180
?
?*
×
1500
?
?*
×
*: MAG plug welding is only allowed on these steel grades in selected locations as specified in the body repair manual. Welding instructions must be followed exactly as specified to ensure adequate weld strength.

MIG welding/brazing: Metal inert gas welding or brazing where 100% Argon (Ar) shielding gas is used. Argon is inert and does not react with the molten weld pool or brazing operation.
MAG welding: Metal active gas welding where the shielding gas being used contains a mixture of 80% Argon (Ar) and 20% Carbon Dioxide (CO2). It is considered active because the CO2 undergoes a limited reaction with the molten weld pool. A shielding gas mixture of 75% argon (Ar) and 25% carbon dioxide (CO2), is also acceptable.