Selection of welding materials

22-04-2019

Selection of welding materials

The selection principle of the electrode is the principle of equal strength, the principle of equivalence, and the principle of condition.

Welding current selection

1) In the actual production process, the welders are based on the test results of the test welding, and select the welding current according to their own practical experience.

2) The current is too small, it is difficult to lead the arc, the electrode is easy to stick to the weldment, the fish scale is thick, and the two sides are not well integrated.

3) The current is too large, the splash and smoke are large during welding, the welding rod is red, the surface of the molten pool is very bright, and it is easy to burn through and bite.

4) The current is suitable, the arc is easy to be stabilized, the splash is small, the uniform hum can be heard, the sides of the weld are smoothly transitioned to the base material, the surface fish scale is very thin, and the welding slag is easy to knock.

Arc voltage selection

The arc voltage mainly affects the width and width of the weld. When welding arc welding, it is mainly controlled by the lateral oscillation of the welding rod, so the influence of the arc voltage is not large.

When the welding current is adjusted, the longer the arc, the higher the voltage. However, when the arc is too long, the combustion is unstable, the splash is large, and there are defects such as undercuts and pores. If the arc is too short, it is easy to stick to the electrode. In general, the arc length is equal to 1/2 or 1 times the diameter of the electrode. .

Selection of welding speed and number of weld layers

The welding speed is the length of the weld that is completed per unit time. The welding speed is flexibly controlled by the welder under the principle of ensuring the required size and shape and good fusion.

When welding thick plates, it is necessary to use multi-layer welding or multi-layer multi-pass welding. The former weld bead preheats the latter weld, and the latter weld heats the previous weld. It is beneficial to improve the flexibility and toughness of the weld metal. The thickness of each weld bead shall not be greater than 1.5 times the diameter of the electrode.


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