ER70S-6 MIG st common type of welding consumable for welding mild steel and these gned to meet minimum tensile strength requirements of 70,000 psi. This tes the proper deoxidizer to absorb oxygen so that it vaporizes into the arc or forms as scale oxides. ER70S-6 is better for creating a smooth transition from the weld to the base metal, also known as wash-in or tie-in. Better wash-in may be a requirement in applications subject to fatigue. ER70S-6 de better wetting at the weld toe when compared to an ER70S-3 r clear="all">A quality MIG al in robotic welding applications.