For straight joint immersed arc welding pipe defective part of the sample, by ultrasonic imperfection detector manually verify the problems in the weld joint placement, use the method of machining exercise issues in the weld sample, after grinding, polishing, etching metallographic specimen.Through the evaluation of the metallographic evaluation, it is found that the weld slag of the welded pipe in the thick wall is located in the position of the blend line of the inside and outdoors welds, as received figure.

Slag is the slag that stays inside the weld.From the concept analysis, automated submerged arc bonded reasons for slag has the complying with 3 factors: basic materials (consisting of the parent metal, steel tube welding cable, flux) of addition is more.Clean up between layers of welding.The application of the welding procedure parameters is not good, and it is not conducive to the development of slag.

According to the manufacturing features of the bonded pipeline in the direct joint, it is feasible to remove the reason that the welding joint is unclean in the multi-layer welding layer.For extra inclusions in the raw material and also make the slag inclusion of weld, take examination prior to welding material, steel bar replacement, new procedures such as filler steels and changes.

Therefore, the main factor for the welding process of the bonded cable is the improper criteria of welding process.The welding process parameters of thick wall joint welding tube are primarily: 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 combination line root cause of slag is primarily fusion line temperature is too low, make the liquid slag can not manage time to speed up; The result is that the temperature level of the fuse is as well reduced due to the fact that the optimal temperature is also low or as well fast.In welding under the influence of groove type, on both sides of the origin of the weld the density of the main area is much much less than the thickness of the air conditioning price is smaller sized than on both sides of the many, therefore, simple slag, on both sides of the weld root., other conditions being the same with the groove Angle and depth of liquified weld depth boosts, the groove boost with the decline of the dimension of the blunt side, it increases with the decrease of the welding speed.When the line energy is consistent, as the weld penetration boosts, the highest possible temperature level of the fuse line decreases, and also the weld is reliant produce slag.

In the astm a53 erw steel pipe multi-wire hidden arc welding, the welding rate has a huge impact on weld depth and thaw width, as well as the quicker the welding rate, steel tube the lower the melting depth and also the melting width.Conversely, the larger the bigger.

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