SU1678564A1 - Method of argon-arc welding of non-rotary pipeline junctions - Google Patents

Abstract

The invention can be used in various fields of mechanical engineering and allows to increase the productivity of welding horizontal, vertical and inclined to the vertical axis at an angle of up to 45 °. pipelines with an internal diameter of 20-80 mm. Horizontal pipelines 1 are joined with a gap 2, a protective chamber 3 with holes 4 is installed on the outside of the pipeline above the joint, and a welding head 5 with partitions 6 is placed under the joint. Partitions 6 form a protective volume 7, the gas pressure in which is regulated by gaps b between the ends partitions and the internal surface of pipelines. The protective gas (argon) 8 through the central hole 9 fills the volume 7 and chamber 3, and the welding is carried out by rotating the head 5. The gap size (5i is chosen in the range of 0.51-3.45 mm. When welding vertical and inclined to the vertical axis of pipelines, the size of the gap 62 between the end of the upper partition and the inner surface of the pipeline is chosen within 0.56- 3.85 mm, and the size of the gap 5h between the end of the lower partition and the inner surface of the pipeline is within 0.47-2.75 mm. It does not reduce the time required for purging Barrier volume argon. 2-f ly ZP. l and 2, Table 1. CO with

Description

FIG. 2

Claims (3)

Claim 1. A method of argon arc welding of fixed pipe joints, in which the welded edges are joined with a gap, and a welding torch with partitions installed on both sides of the torch and creating a volume filled with protective gas is placed on the inside of the joint, characterized in that, in order to increase welding productivity by reducing the time of purging the system with shielding gas, the gaps between the ends of the partitions and the inner surface of the pipelines are set within 0.47-3.85 mm, while externally side of the joint establish a protective chamber. 2. The method of pop. The boiler is available in that when welding horizontal pipelines, the gaps between the ends of the partitions and the inner surface of the pipelines are set within 0.51-3.45 mm; 3. The method of pop. 1, characterized in that when welding vertical or inclined to the vertical axis of the pipelines, the gap between the end of the upper partition and the inner surface of the pipeline is selected within 0.56-3.85 mm, and the gap between the end of the lower partition and the inner surface of the pipeline is set within 0.47 -2.75 mm.  Experience Piping position Argon consumption, l / min Q Joint clearance , 6 Diameter of holes, in the chamber, mm d The diameter of the piping. mm 0 Coef, prog. MII / l to The amount of gaps, km Weld formation quality A 1 8.0 0.2 1.8 20 24 3.45 - - Yaow without oxidation 2 9.0 0.15 1.3 thirty 27 1.57 - - Also 3 10.5 0.15 1.3 fifty 31.5 1.29 - 4 Gorivoktalkov 13.0 0.1 0.8 80 39 0.51 - 5 8.0 0.25 1.8 20 24 4.3 - - Sagging willow root 6 13.0 0.05 0.8 80 39. 0.25 - - Difficult burners 7 8.0 0.2 1.9 20 24 3.65 - - Oxidation of willow metal 8 13.0 0.1 0.7 80 39 0.45 - - Willow Root Oxidation . 9 8.0 0.2 1.8 20 / 24 - 2.75 3.85 it is without oxidation 10 Vertical-* 13, about oh 1 0.8 80 39 - 0.47 0.56 Also new eleven 8.0 0.2 1.8 20 24 - 2.75 4.15 Oxidation of willow metal ' 12 13, about 0.1 0.8 80 39 - 0.47. 0.52 Willow Root Oxidation 1 Figure 2