Welding is divided into two types: movable mouth and fixed mouth, and the latter is divided into horizontal fixing, vertical fixing and inclined fixing. When welding a union, it can be welded at the position of 12 all the time, which is equivalent to welding a flat seam. Vertical fixing is the same as horizontal welding. The transverse fixing is called all-position welding, which is completed in two and a half turns from 6: 00 to 12. Inclined fixation is similar to horizontal fixation, except that the coated electrode needs to be pulled obliquely.

As for covered electrode's point of view, this is only a theoretical statement. In fact, it makes no sense to measure the angle with a ruler at the beginning of learning, but it is almost enough. If the angle is wrong, it is easy to weld. Generally, in covered electrode, covered electrode is bent into an arc, welded at an angle of 30-60 degrees with the welding surface, and welded from bottom to top.