BEAT THE HEAT – Avoid Repair Damage with MIG Brazing

| September 1, 2017
 

Help avoid potential repair damage with MIG Brazing
Forget, for a moment, about all-aluminum vehicles. And carbon-fiber intense models. And any other futuristic materials being discussed in technical circles. In the automotive industry, the future is now. A big part of that future are hybrid construction vehicles — those made from a mixture of aluminum, Ultra High Strength Steel (UHSS), Ultra Advanced High Strength Steel (UAHSS) and traditional steel. When repairing these vehicles, high heat can be the enemy, specifically searing welding heat that may damage sensitive materials and wreak havoc on critical safety and vehicle response systems.

That’s why you’re hearing about MIG brazing.
Compared to conventional Metal Inert Gas (MIG) and Metal Active Gas (MAG) welding, MIG brazing is a type of arc welding that enables welders to join metal parts at a relatively low temperature. The lower temperature can help reduce the risk of burn-through, distortion and stress in the base metal.


MIG brazing is useful in instances where the base metal may be weakened by the application of heat.


Basic benefit
Lower heat input is the primary benefit of MIG brazing, which utilizes lower amperage and voltage settings. Less heat builds up in the base metal, which minimizes the corrosion of zinc near the weld. MIG brazing is useful in instances where the base metal may be weakened by the application of heat.

Be warned
MIG brazing weld strength may not match that of comparable steel welds. Therefore, MIG brazing should only be used to replace factory MIG brazing or when directed to in the General Motors collision repair procedures.
Still have questions? Reach out to your welding vendor. GM also can lend a helping hand. A future web-based training class from GM will provide more critical instructions on when and how to use this valuable bonding procedure that continues to grow in importance.

Other advantages
MIG brazing creates joints with less distortion and a smaller heat-affected zone than other types of welding at higher temperatures, and may be better for joining high-strength alloy steel and coated sheets.

MIG brazing also features other benefits:

  • Relatively low heat input
  • Less spatter in the arc
  • Low zinc burn-off
  • Good gap bridging
  • Soft bead for easier finishing
  • Less distortion in the base metal
  • Lower risk of burn-through

 

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Category: The Technical Side