Argon / Carbon Dioxide / Hydrogen Mix
Overview
Small additions of hydrogen (1-2%) have been shown to improve bead wetting and arc stability when Pulse MIG welding stainless steel. The CO2 is also kept low (1-3%) to minimize carbon pick-up and maintain good arc stability. This mixture is not recommended on low alloy steels in the excessive weld metal hydrogen levels could develop causing weld cracking and poor mechanical properties.