MIG Welding Practice Exam 2025 – Complete Prep Guide

The appropriate current setting for welding 5/16 inch stainless steel using the spray transfer mode is critical for achieving optimal penetration and bead appearance. In spray transfer, a higher current setting is required compared to short-circuit transfer because it involves melting the electrode wire so that it can form a fine spray of molten metal. This allows for a continuous and stable arc, essential for welding thicker materials like 5/16 inch stainless steel.

Setting the current between 200-210 amps provides sufficient energy to create the necessary heat required for proper penetration into the base metal without becoming excessively hot, which could lead to burn-through or warping. This current range is also efficient for maintaining the stability needed during the spray transfer process, ensuring a sound weld with minimal imperfections.

Other options provide higher or lower current settings that may not be suitable for effectively welding this thickness of stainless steel using spray transfer, which can lead to insufficient penetration or compromise the integrity of the weld.