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Analysis on the phenomenon of slag inclusions during welding

Analysis on the phenomenon of slag inclusions during welding of stamping elbow
................................... When connecting the punching elbow to the pipe, pay attention to the slag during welding. The meaning of slag is in non-metallic inclusions.
And the main reason for this phenomenon is to say or pipe, or stamping elbow products above the groove processing is not correct, is too small angle, which is a reason, there is a reason is that the welding current is too small, the viscosity of the slag too much such a problem. Because the viscosity is too large, it causes the slag to float to the surface, thus causing the phenomenon of slag inclusions. Then there is gas welding torch flame can not be enough, in the welding stamping elbow and pipe when the work of cleaning the workpiece did not do a good job, the use of at oxidizing flame, or in the swing amplitude too small did not pull the slag out in time, all caused welding slag. After the bulk of the medicine on the electrode was peeled off, it was not fully melted. Multiple layers of weld seam are also one of the reasons.
Welding If there is a phenomenon of slag, will reproduce the welding finished, pressure test or in the process of use will be leakage or leakage of the phenomenon occurred, so it must be in the welding stamping elbow to eliminate such phenomena. Carbon steel elbow first according to its radius of curvature, can be divided into long radius elbow and short radius elbow. A long radius elbow is a pipe diameter equal to 1.5 times times its radius of curvature, i.e. r=1.5d. A short radius elbow refers to its radius of curvature equal to the outer diameter of the pipe, i.e. r=1.0d. (d for Elbow diameter, R for radius of curvature) if graded according to the pressure level, there are about 17 kinds, and the U.S. pipe standard is the same: sch5s, sch10s, Sch10, Sch20, Sch30, sch40s, STD, Sch40, Sch60, sch80s, XS Sch80, Sch100, Sch120, Sch140, Sch160, XXS, the most commonly used are STD and XS two kinds.
According to the angle of the elbow, there are 45° elbow, 90° elbow and 180° elbow. Carbon steel quality, can be divided into 10# 20# A3 q235a 20g 20G 16Mn ASTM A234 ASTM A105 ASTM A403 and so on.
The elbows made of these materials are called carbon steel elbows.

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