The Root cause of The Slag In The Welding Tube

For straight seam immersed arc welding pipeline malfunctioning part of the sample, by ultrasonic flaw detector manually verify the defects in the weld joint position, utilize the method of machining work out issues in the weld sample, after grinding, brightening, etching metallographic specimen.Through the analysis of the metallographic analysis, it is found that the weld slag of the welded pipeline in the thick wall is located in the position of the blend line of the within as well as outdoors welds, as received number.

Slag is the slag that remains inside the weld.From the theory evaluation, automatic submerged arc bonded sources of slag has the complying with three factors: resources (consisting of the parent steel rod, welding wire, flux) of incorporation is more.Clean up in between layers of welding.The application of the welding procedure parameters is bad, as well as it is not for the development of slag.

According to the manufacturing qualities of the welded pipeline in the direct joint, it is feasible to remove the factor that the welding seam is unclean in the multi-layer welding layer.For more inclusions in the raw material and also make the slag inclusion of weld, take examination before welding material, replacement, new actions such as filler steels and fluxes.

Therefore, the main factor for the welding procedure of the bonded cord is the incorrect parameters of welding process.The welding process criteria of thick wall surface seam welding tube are mostly: line power, welding present, welding voltage, welding rate, wire spacing, groove size and more.

To do comprehensive analysis from the elements of welding metallurgy: weld blend line root cause of slag is primarily fusion line temperature level is too low, make the liquid slag can not pay for time to precipitate; The outcome is that the temperature level of the fuse is too reduced because the peak temperature is as well reduced or as well fast.In welding under the influence of groove kind, on both sides of the root of the weld the density of the main area is much less than the thickness of the cooling price is smaller sized than on both sides of the lots of, therefore, simple slag, on both sides of the weld root., various other problems being the same with the groove Angle and deepness of liquified weld depth increases, the groove boost with the reduction of the size of the blunt edge, it increases with the reduction of the welding speed.When the line energy is constant, as the weld infiltration boosts, the greatest temperature level of the fuse line lowers, and also the weld is reliant generate slag.

In the astm a53 erw steel pipeline multi-wire buried arc welding, the welding rate has a big effect on weld depth and also melt width, as well as the faster the welding rate, the lower the melting depth and steel pipe the melting width.Conversely, the bigger the bigger.

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