For straight joint immersed arc welding pipe defective part of the example, by ultrasonic flaw detector manually validate the flaws in the weld seam position, use the technique of machining exercise flaws in the weld cross section, after grinding, polishing, engraving metallographic specimen.Through the evaluation of the metallographic evaluation, it is found that the weld slag of the welded pipe in the thick wall lies in the placement of the fusion line of the inside and outside welds, as displayed in figure.

Slag is the slag that remains inside the weld.From the theory analysis, automated submerged arc weld root causes of slag has the adhering to 3 points: basic materials (consisting of the parent metal, welding cord, change) of addition is more.Clean up in between layers of welding.The application of the welding process specifications is bad, and it is not for the development of slag.

According to the production features of the bonded pipe in the straight seam, it is feasible to remove the factor that the welding joint is not clean in the multi-layer welding layer.For much more incorporations in the raw product as well as make the slag incorporation of weld, take inspection before welding material, replacement, new steps such as filler steels and fluxes.

As a result, the major reason for the welding procedure of the welded cable is the incorrect parameters of welding process.The welding process parameters of thick wall surface joint welding tube are mostly: line power, welding existing, welding voltage, welding speed, cable spacing, groove size and more.

To do thorough evaluation from the aspects of welding metallurgy: weld combination line causes of slag is mostly combination line temperature is also low, steel bar make the fluid slag can not pay for time to speed up; The result is that the temperature of the fuse is as well reduced due to the fact that the optimal temperature is as well low or as well fast.In welding intoxicated of groove kind, on both sides of the origin of the weld the density of the central area is far much less than the thickness of the cooling price is smaller sized than on both sides of the numerous, for that reason, simple slag, on both sides of the weld root., various other conditions coinciding with the groove Angle and also deepness of liquified weld deepness rises, the groove boost with the decrease of the size of the blunt edge, it increases with the decline of the welding speed.When the line energy is continuous, as the weld penetration boosts, the highest possible temperature of the fuse line decreases, as well as the weld is liable to generate slag.

In the astm a53 erw steel rod pipeline multi-wire buried arc welding, the welding rate has a big effect on weld deepness and also thaw width, and the quicker the welding rate, the reduced the melting depth as well as the melting width.Conversely, the bigger the larger.

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