Notes

The Cause Of The Slag In The Welding Tube

For straight seam submerged arc welding pipeline faulty component of the sample, by ultrasonic defect detector by hand confirm the flaws in the weld seam setting, make use of the method of machining work out problems in the weld sample, after grinding, polishing, etching metallographic specimen.Through the evaluation of the metallographic evaluation, it is located that the weld slag of the welded pipe in the thick wall lies in the position of the combination line of the within as well as outside welds, as displayed in figure.


Slag is the slag that stays inside the weld.From the theory analysis, automated immersed arc weld causes of slag has the complying with three factors: raw materials (consisting of the parent steel, welding cord, flux) of addition is more.Clean up in between layers of welding.The application of the welding process parameters is bad, as well as it is not conducive to the emergence of slag.


According to the production characteristics of the bonded pipeline in the straight joint, it is feasible to eliminate the reason that the welding joint is not clean in the multi-layer welding layer.For much more incorporations in the raw product and make the slag incorporation of weld, take examination prior to welding material, replacement, brand-new actions such as filler metals and changes.


Because of steel pipe supply , the major factor for the welding procedure of the bonded cord is the improper specifications of welding process.The welding procedure specifications of thick wall seam welding tube are mainly: line energy, welding existing, welding voltage, welding speed, wire spacing, groove dimension and so on.


To do extensive analysis from the facets of welding metallurgy: weld fusion line reason for slag is generally blend line temperature level is too low, make the liquid slag can not manage time to speed up; The result is that the temperature of the fuse is also reduced since the optimal temperature level is as well reduced or as well fast.In welding drunk of groove type, on both sides of the root of the weld the thickness of the main area is far much less than the thickness of the air conditioning price is smaller than on both sides of the lots of, consequently, easy slag, on both sides of the weld root., other conditions being the same with the groove Angle and also deepness of molten weld deepness rises, the groove rise with the reduction of the size of the blunt edge, it enhances with the decrease of the welding speed.When the line power is constant, as the weld infiltration increases, the greatest temperature level of the fuse line reduces, and also the weld is reliant generate slag.


In the astm a53 erw steel pipeline multi-wire hidden arc welding, the welding rate has a huge result on weld depth and also thaw width, and also the quicker the welding rate, the lower the melting deepness and the melting width.Conversely, the larger the larger.

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