What is the only GMAW electrode that can be used on DC negative?

The electrode that can be used on DC negative for Gas Metal Arc Welding (GMAW) is specifically designed to promote proper arc stability and bead appearance when utilizing this polarity. Among the given options, E70C-X is the only GMAW electrode that meets this criterion.

GMAW commonly uses two types of polarity: Direct Current Electrode Positive (DCEP) and Direct Current Electrode Negative (DCEN). While most GMAW electrodes are optimized for DCEP, E70C-X is engineered to work effectively with DCEN. This allows for better penetration in the weld joint and improved weld quality under certain conditions, making it versatile for various applications.

Understanding the specific characteristics and intended applications of each electrode is crucial. The other options either do not specify compatibility with DCEN or are more commonly associated with DCEP. Hence, E70C-X stands out as the unique choice that can be utilized effectively on DC negative, which enhances a welder’s ability to choose the appropriate electrode for different welding scenarios.