Arc Welding Part 1

The arc welding makes arcs between a material and a welding rod. And it is a well used welding method.
In the arc welding, we use a torch with a welding rod as shown in Figure 1. And both of the material and the welding rod are ment in the arc.

The arc welding is very high speed, and if the welding is very well, the strength is very high. But the arc is very light, then we cannot see the welding processes.
A beginner may be often failed the welding.
All weldings, including the arc welding, need higher technique than cutting processings, because we do not have the same conditions.

As shown in Figure 2, An arc welding machine is connected to electric cables to the electric source, the torch and the material (earth).
After switch on the machine, the welding rod is touched to the material, and the arc occures.
The basic handling of the arc welding is in follows.

Actual Arc Welding

Angle of Welding Rod

In the arc welding, it is important to set the angle of a welding rod (coated electrode).
As the most fundamental welding, the case where two griddles (mother material) are welded in the shape of [ of a transverse direction ] a straight line is considered.

It welds laying down about 45 degrees of wedding rods in the direction of the right (in the case of a right-handed person) from the left, as shown in Fig. 3 (a).
And it is the foundations which are maintained at the same angle (90 degrees) to two griddles.

As shown in Fig. 3 (b), when a wedding rod is leaned, a material opposite to the leaned side becomes easy to melt. Welding is advanced checking that both of material melts uniformly using this.