Select the appropriate type of current for stable arc transmission and optimum seam quality, tailored to the material and welding process.
- TIG welding of aluminum requires the use of alternating current (AC) to remove the oxide layer and produce a clean seam.
- When MIG welding aluminum, use direct current with a positive electrode (DC+, DCEP).
- Copper is also welded with direct current (DC+) in the MIG and TIG process, as this enables deep fusion with high thermal conductivity.