How to master the welding angle as soon as possible to avoid welding defects

The so-called welding skills are simple welding methods, correct electrode angle and operation, and your welds will not be too bad.

At the beginning of welding, due to the lack of mastery of the welding rhythm and unskilled handling techniques, it will cause pauses. If it is deeper and shallower, it will easily cause pores, Writing is the same, stroke by stroke.

Several defects of welding：

1.External undercut

Welding process parameter selection is not correct or the operation is not standard, welding along the base metal parts of the formation of the groove or depression, known as biting edge. (At the beginning of welding because do not know the size of the current and welding hand instability is easy to cause biting, to prevent biting is to practice welding techniques, must be stable, do not be anxious.)

                                This is a picture of the undercut

2.Stomata

During welding, the gas in the molten pool fails to escape when it solidifies and remains in the weld to form a cavity, which is called a porosity. (At the beginning of welding, due to the inability to grasp the welding rhythm and the unskilled handling of the strips, it will cause pauses. If it is deeper and shallower, it will easily cause pores. Calligraphy and writing are the same, one stroke at a time.)

                              This is the air hole of the welding

3.Not penetrated, not fused

There are many reasons for incomplete penetration and infusion, such as too small weld gap or groove angle, too thick blunt edge, too large electrode diameter, too fast welding speed or too long arc, etc. It is also possible that the welding effect may be affected by impurities in the groove, and unmelted impurities may also affect the fusion effect of the weld.

(Only control the welding speed, current and other process parameters during welding, correctly select the groove size, and remove the scale and impurities on the surface of the groove; the root of the back cover welding must be thoroughly cleaned.)

                                      Incomplete penetration

4.Burn through

During the welding process, the molten metal flows out from the back of the groove, forming a perforated defect called burn-through. (The prevention method is to reduce the current and reduce the weld gap)

                              Welding pictures burn through

5.Unsightly welding surface

Defects such as lapping and serpentine bead are all caused by too slow welding speed and too low welding current. (The way to prevent it is to practice more and grasp the appropriate welding speed. Most people will do this at the beginning, practice more.)

                         Serpentine welding

                            lap welding