The,Cause,Slag,Welding,Tube,Fo business, insurance The Cause of The Slag In The Welding Tube
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For straight seam submerged arc welding pipe defective part of the sample, by ultrasonic flaw detector manually confirm the defects in the weld seam position, use the method of machining work out defects in the weld cross section, after grinding, polishing, etching metallographic specimen.Through the analysis of the metallographic analysis, it is found that the weld slag of the welded pipe in the thick wall is located in the position of the fusion line of the inside and outside welds, as shown in figure.Slag is the slag that remains inside the weld.From the theory analysis, automatic submerged arc weld causes of slag has the following three points: raw materials (including the parent metal, welding wire, flux) of inclusion is more.Clean up between layers of welding.The application of the welding process parameters is not good, and it is not conducive to the emergence of slag.According to the production characteristics of the welded pipe in the direct seam, it is possible to eliminate the reason that the welding seam is not clean in the multi-layer welding layer.For more inclusions in the raw material and make the slag inclusion of weld, take inspection before welding material, replacement, new measures such as filler metals and fluxes.As a result, the main reason for the welding process of the welded wire is the improper parameters of welding process.The welding process parameters of thick wall seam welding tube are mainly: line energy, welding current, welding voltage, welding speed, wire spacing, groove size and so on.To do in-depth analysis from the aspects of welding metallurgy: weld fusion line causes of slag is mainly fusion line temperature is too low, make the liquid slag can not afford time to precipitate;The result is that the temperature of the fuse is too low because the peak temperature is too low or too fast.In welding under the influence of groove type, on both sides of the root of the weld the thickness of the central region is far less than the thickness of the cooling rate is smaller than on both sides of the many, therefore, easy slag, on both sides of the weld root., other conditions being the same with the groove Angle and depth of molten weld depth increases, the groove increase with the decrease of the size of the blunt edge, it increases with the decrease of the welding speed.When the line energy is constant, as the weld penetration increases, the highest temperature of the fuse line decreases, and the weld is liable to produce slag. In the astm a53 erw steel pipe multi-wire buried arc welding, the welding speed has a large effect on weld depth and melt width, and the faster the welding speed, the lower the melting depth and the melting width.Conversely, the larger the larger.
The,Cause,Slag,Welding,Tube,Fo