Pulse Transfer Mode Needed For Aluminum Welding?
Did you know that the OEM collision repair procedures for aluminum intensive vehicles that include arc welding require GMAW MIG welders capable of welding in the pulse transfer mode? It's true. For this reason GMAW MIG pulse welders are also required for the I-CAR Welding Training & Certification: Aluminum GMA (MIG) Welding (WCA03) that is required by some vehicle makers.
Why is this required? Welding aluminum in the pulse transfer mode helps weld thin gauge aluminum without burn-through. (See Figure 1) Pulse transfer mode also helps weld heaver-gauge aluminum by improving root-fusion, minimizing porosity, and contributes to making a strong weld joint. Almost all GMAW MIG welders have the ability to weld aluminum, but be sure that the welder has a pulse transfer setting, and is not just a short circuit transfer machine.
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