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DPX 800MPA M B: Recommended GM Steel Reparability Matrix

This document provides a matrix summarizing GM's recommendations for reparability of different steel grades used in vehicle manufacturing. It lists the steel identification symbols, grades, recommended welding methods for repair, suitability for cold repair, use of heat for repair, recommended temperature range and maximum heat times. Mild steel, bake hardened steel and solid solution strengthened steel grades can generally be repaired using MIG or resistance spot welding, with cold repairs allowed if damage excludes kinks. Higher strength steel grades have additional restrictions around welding methods and use of heat during repair. Ultra high strength and dual phase steel grades over 800MPa cannot be cold repaired or use heat in the repair process.

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176 views2 pages

DPX 800MPA M B: Recommended GM Steel Reparability Matrix

This document provides a matrix summarizing GM's recommendations for reparability of different steel grades used in vehicle manufacturing. It lists the steel identification symbols, grades, recommended welding methods for repair, suitability for cold repair, use of heat for repair, recommended temperature range and maximum heat times. Mild steel, bake hardened steel and solid solution strengthened steel grades can generally be repaired using MIG or resistance spot welding, with cold repairs allowed if damage excludes kinks. Higher strength steel grades have additional restrictions around welding methods and use of heat during repair. Ultra high strength and dual phase steel grades over 800MPa cannot be cold repaired or use heat in the repair process.

Uploaded by

Silverio Acuña
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Recommended GM Steel Reparability Matrix

Steel ID Grade GM Welding Method Cold Use of Temp. Range Maximum


Stamping Specifications repair Heat for Heat
Symbols⁴ MIG RSW MIG Braze1 repair
Mild Steel GM6409M (all) Yes Yes Yes Yes2 Yes Up to 1200 °F 90 sec. x 2
GMW2M (all) (650 °C)
Laminate steel NO Yes NO Yes2 NO

Bake Hardened GM6093M (all) Yes Yes Yes Yes2 Yes Up to 1200 °F 90 sec. x 2
GMW3032M(all) (650 °C)
Solid Solution- Yes Yes Yes Yes2 Yes Up to 1200 °F 90 sec. x 2
Strengthened (650 °C)
High Strength, Low GM6208M (all), Yes Yes Yes Yes2 Yes Up to 1200F 90 sec. x 2
Alloy GM6218M(all), (650 °C)
GM3032M(HR CR
grades)
Dual Phase ≤799 GMW3032M (HR DP Yes Yes Yes Yes2 No N/A N/A
MPA min. UTS and CR DP grades)
GMW3399M (HR
DP, CR DP and HR
HE grades with
TS<800MPa)

DPX Dual Phase ≥800


MPA min. UTS³
GMW3399M(all
other HR DP, CR DP
Yes³ Yes Yes³ No No N/A N/A

≥800MPA and HR HE Grades)

M UHSS³
Martensitic³
GM6123M (all)
GMW3399M (all MS
Yes³ Yes Yes³ No No N/A N/A

Boron (PHS/Hot-
B Stamped) ³
grades)
GMW14400

1
Must use 8mm x16mm slotted holes
2 Cold repairs can be performed if damage excludes kinks.
³ Mig Plug Only, NO STITCH WELDING. These steels may NOT be used as a backer for stitch welding. NOTE. Deviation from this chart is ONLY allowed if
there has been a crash analysis completed by the Design Engineer and a Service procedure has been written. NOTE number values are tensile strength
⁴ ISO Symbol for repair.
Note: GM does not endorse repair of door impact beams.
Dual phase Steels up to DP 800 may be sectioned with a sleeve or backer plate.

Revised 2-1-2010
Descriptions of GM Steel
Grade Alloy Content Heat Treatment Typical Applications Comments
Mild Steel, Bake Hardened, Solid Low Fully Body Panels (Closures, floor
Solution Strengthened Annealed/Dead pan, dash panel, etc.)
Soft
High Strength Low Alloy Low Fully Rails, Structural Members Strengthened with fine
Annealed/Dead particles and small
Soft grain size
Dual Phase Medium Fully Rails, Structural Members 15-50%of structure is
(Manganese, Annealed/Partially “hard” martensite
Silicon, Hardened
Molybdenum,
Chromium)
Ultra High Strength Steel Low Fully Hardened Rocker reinforcements, door 100% of structure is
(Martensitic, Boron) beams, bumper beams “hard” martensite
TRIP (Transformation Induced High Fully TBD Complex
Plasticity) Steel (Manganese, Annealed/Partially microstructure for high
Phosphorus, Hardened strength and ductility
Silicon,
Aluminum)

Revised 2-1-2010

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