Arc shape during welding of S420M steel plate

When the current and voltage are constant, the shape of the arc remains unchanged, but it will move up and down along with the size of the included angle of the S420M steel plate groove, without causing any left to right changes. When the arc voltage is constant, the distance between the arc melting point and the base metal is the same. The smaller the viewing point of the S420M steel plate groove, the greater the distance between the root of the lower groove of the arc as the arc moves upward to adhere to its original shape; On the contrary, the larger the viewing point of the groove, the smaller the interval when the arc adheres to its original shape and moves downward.

Because the arc of S420M steel plate is controlled by voltage, the arc length is proportional to the voltage and changes with the voltage. When changing the viewpoint of the groove, the distance between the arc and the groove root is significantly different.