According to different materials and thicknesses, the choice of welding wire, current and voltage is also different.

The movable arm is a thin-plate box structure, and the deformation should be considered first when welding. Generally, the method of subsection symmetrical welding is adopted.

At the same time, reinforcing ribs are used to reduce welding deformation. After welding, heat treatment (stress annealing) is required, and the reinforcing ribs can only be taken out after being stored at room temperature for 24-48 hours.

See table 1 and table 2 for welding process parameters.

Table 1:φ 1.2 welding process parameters for CO2 welding of welding wire

Joint form, thickness and number of layers, welding current (a), arc voltage (v), welding wire protrusion (mm), welding speed m/min, gas flow L*min, and assembly gap (mm).

6 1 270 27 12- 14 0.55 10- 15 1.0- 1.5

6 2 190-2 10 19-30 15 0.25 15 0- 1

8 2 120- 130 130- 140 26-27 28-30 15 0.55 20 1- 1.5

10 2 130- 140280-300 20-30 30-33 15 0.55 20 1- 1.5

10 2 300-320300-320 37-39 37-39 15 0.55 20 1- 1.5

12 3 10-330 32-33 15 0.5 20 1- 1.5

16 3 120- 140300-340300-340 25-2733-3535-37 15 0.4-0.50.3-0.40.2-03 20 1- 1.5

16 4 140- 160260-280270-290270-290 24-263 1-3334-3634-36 15 0.2-0.30.33-0..5-0.60.4-0.5 20 1- 1.5

20 4 120- 140300-340300-340300-340 25-2733-3533-3533-37 15 0.4-0.50.3-0.4 20 4 1 40-654 38+060260-280300-320300-320 24-263 1-3335-3735-37 15 0.25-0.3 0.45-0.5 20 1- 1.5

Table 2: φ 1.2t joint of CO2 shielded welding wire

Joint form thickness (㎜) welding wire diameter (㎜) welding current (a) arc voltage (v) welding speed (m/min) gas flow (L/min) welding angle size (㎜)

2.3 Φ 1.2 120 20 0.5 10- 15 3.0

3.2 Φ 1.2 140 20.5 0.5 10- 15 3.0

4.5 Φ 1.2 160 2 1 0.45 10- 15 4.0

6 Φ 1.2 230 23 0.55 10- 15 6.0

12 Φ 1.2 290 28 0.5 10- 15 7.0

The drawings of the boom are not available.