Straight seam steel pipe swing welding technology installation
Source：http://www.jmzkkj.comRelease Time：2018-06-01
The welding current in the straight seam steel pipe swing welding is slightly larger than the traditional welding method. Secondly, the tungsten electrode elongation in the swing seam welding of the straight seam steel pipe is determined according to the pipe wall thickness, which is usually 4-5 mm; the argon gas flow is slightly larger than the traditional welding method. , About 8-10l/min; Finally, the swing amplitude of the straight seam steel pipe is 2mm at the blunt edge of both sides of the fusion seam; the left and right hands are flexibly matched, swing uniformly, and the wire is evenly distributed. Straight seam steel pipe swing welding technology is generally used for welding thick-walled straight seam steel pipe. The technical parameters of the welding method of the straight seam steel pipe are slightly different from those of the traditional linear welding method. The first is that the tip of the porcelain tip of the argon arc welding is slightly thicker than the traditional straight line welding method. There are also differences. For the φ89×5 00Cr19Ni10 weld, for example, the gap between the traditional linear welding method is 0~3mm and the swing method is 4mm. The welding specification is also different.
Thick-walled pipe TIG root welding swing welding technology installation Chemical purification equipment often encountered thickness of 12 ~ 16mm pressure pipe and the three links of the welding, the general material for the 20,20 G seamless steel pipe. During the operation of the pipeline, the pressure and instantaneous load and negative pressure of 1.5~2.0 MPa are tolerated, and the medium in the pipeline includes water, chlorine and nitrogen. In the welding construction process, manual tungsten arc welding root welding, electrode arc welding, and capping are often used. Among them, the root welding layer is the key to ensure the entire welding seam.
1. The traditional construction method Pipeline construction adopts manual tungsten-arc argon arc welding root welding single-sided welding double-sided forming method. The common method of argon arc welding root welding is: the distance between the nozzle of the welding torch and the groove of the pipe wall is maintained, and the right thumb is used. And the index finger grabs the welding torch, and the remaining 3 fingers lean against the wall of the pipe to support swinging left or right (or directly suspending the bar). Due to the large wall thickness, this method is not easy to form a good protection and weld formation, and at the same time, the tungsten electrode will damage the tungsten electrode due to its long protrusion, resulting in defects such as tungsten pinholes. In order to solve these problems, we have adopted swinging welding techniques.
2. Swing Skill Welding and Characteristic Swing Skill Welding is to press the nozzle of the welding torch directly into the groove of the pipe wall, using the wrist to oscillate greatly, so that the friction between the two sides of the nozzle and the groove is slowly moved forward. The arc is used to heat and melt the blunt groove. An applied method of forming a weld seam by welding wire at the edge and filling it.
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