3.1. Introduction

3.1. Introduction

 

The multipass welding function can be used when a single operation of welding cannot be applied because the required leg length for the arc welding of thick plates is wide or when the welding needs to be repeated several times because the volume to be filled through welding is large.

 

Because of the characteristics of arc sensing, sensing may be unstable, except for the root pass, so the welding line following should be performed through arc sensing only in the case of the root pass. The following trajectory needs to be saved, and the saved trajectory needs to be shifted to create more than two passes for the welding work.

Because the position of the multipass work program just needs to be maintained along the same trajectory as that of the root pass, the multipass work can be performed simply by copying the root pass work program and then only inserting the multipass command.

 

Figure3.1 Multipass welding for the 2nd and 3rd passes after arc sensing (left) for the root pass

 

Figure3.2 Actual multipass welding

 

When the multipass beads are created in an inclined laminated form as shown in Figure 3.2, welding can be performed in the laminated form as shown below if you modify the welding start and end points by recording them by pulling them slightly.

 

Figure3.3 Inclined laminated multipass shape