Which electrode type is considered to have shallow penetration?

The choice indicating that 6013 electrodes are considered to have shallow penetration is accurate due to the specific characteristics of these electrodes. 6013 electrodes are designed for general-purpose welding and produce a medium to low penetration profile. This is largely due to their coating composition, which allows for a smoother, more controllable arc and creates a clean, aesthetically pleasing bead, making them ideal for applications such as thin materials where deep penetration is not required.

In contrast, the other electrode types are known for different penetration profiles. For instance, 6010 and 6011 electrodes are designed to provide deeper penetration, particularly in situations where root fusion is vital, such as in pipe welding. The 7018 electrodes are also recognized for a deeper penetration due to their low hydrogen content and strong arc characteristics, making them suitable for structural steel applications. Thus, the characteristics of each electrode type directly relate to their depth of penetration in welds, with 6013 clearly classified as having a shallower penetration compared to the others.