Los Angeles City Structural Welding Code – Steel (D1.1) Certification Practice Test 2025 – Complete Guide to Master Your Certification!

The use of DC positive polarity with ER70S-6 electrodes is typically preferred due to its ability to provide a more stable arc and better penetration. In this polarity configuration, the workpiece is connected to the positive terminal of the power supply, which facilitates a more efficient transfer of heat into the workpiece. This results in a hotter arc, which is advantageous for achieving a strong weld quality and good fusion in various welding positions.

Using DC positive also helps in minimizing spatter and improving the overall weld appearance. This electrode is designed for use in MIG (Metal Inert Gas) welding processes, where the advantages of using DC positive polarity can significantly enhance the performance and characteristics of the weld.

In contrast, the other polarities have limitations when used with this type of electrode; for example, AC may not provide the same level of heat concentration or stability needed for optimal performance, while DC negative is more commonly used with different types of electrodes and applications that require a different heat input and weld characteristic. Thus, DC positive is the ideal choice for ER70S-6 as it aligns with its design and intended applications in welding.