What is arc initiation?

The process of igniting and producing a stable arc is called arc ignition. There are two methods of arc ignition: the scratching method and the direct contact method.

In the scratching method, the end of the welding rod is aimed at the ignition point, and then the rod is lightly scratched across the surface of the workpiece using wrist force, similar to striking a match. The scratching distance is 10-20 mm, and the welding rod is then lifted 3-3 mm.

In the direct contact method, the welding rod is gently touched to the welding area of ​​the workpiece, and then the rod is lifted 2-3 mm at the appropriate time to ignite the arc.

When igniting the arc, the lifting motion of the welding rod should be quick; otherwise, it is easy for the rod to stick to the workpiece. If the rod sticks, it can be pulled away by shaking it from side to side. If it still doesn't detach, release the welding clamp, disconnect the welding circuit, and wait for the workpiece to cool slightly before proceeding.

The following points should be noted during arc ignition:

(1) After arc ignition, the arc length should not exceed the diameter of the welding rod. Do not apply excessive force during arc ignition to prevent the flux coating at the ignition end from cracking or even falling off, which would affect arc ignition and welding.

(2) Do not strike the arc randomly on the workpiece, especially with high-strength steel, low-temperature steel, and stainless steel. This is because the arc-scratched area is prone to hardening or microcracking, and in stainless steel, it can reduce corrosion resistance.

(3) If the welding rod is stuck to the workpiece and cannot be removed by shaking, immediately remove the welding clamp. After the welding rod cools down, it will be easy to remove.