Features of Weld Joint of ERW Steel Pipeline
The most significant distinction between straight joint high frequency electric resistance welded pipe (referred to as ERW) as well as smooth steel pipeline is that ERW has a weld, which is likewise the key to the quality of ERW steel pipeline. Modern ERW steel pipeline production technology and also equipment, due to years of continuous efforts internationally, specifically in the United States, has made the seamlessness of ERW steel pipes a relatively acceptable remedy. Some people split the seamlessness of ERW steel pipes into geometric seamlessness as well as physical seamlessness.
Geometric seamlessness is to get rid of the inner and also external burrs of the ERW steel pipe. As a result of the continuous enhancement and also excellence of the structure of the internal burr removal system and also the cutting tools, the removal of burrs in big and medium-diameter steel pipes has been far better dealt with. The interior burr can be managed within -0.2 mm ~ +0.5 mm. Physical seamlessness describes the distinction between the inner metallographic structure of the weld and the base metal, which results in a decrease in the mechanical residential or commercial properties of the weld area, and actions need to be required to make it uniform as well as regular. The high-frequency welding thermal procedure of ERW steel pipeline produces a temperature circulation slope near the edge of the tube space, and forms particular areas such as melting zone, semi-melting zone, overheated structure, normalizing zone, insufficient stabilizing area, and fire zone. Among them, the superheated zone framework because of the welding temperature level over 100, the austenite grains grow up greatly, which will develop difficult and weak rugged crystal phases under cooling conditions. Furthermore, the presence of temperature level slopes will cause welding anxiety. In this way, the mechanical homes of the welding dimension are less than that of the mom village.
Physical seamlessization is through the regional conventional warm therapy process of the weld, that is, the medium frequency induction home heating gadget is made use of to heat the weld location to AC3 (927 ° C), and afterwards do an air cooling procedure with a length of 60m and also a speed of 20m/min, and then water air conditioning when necessary. Making use of this approach attains the purpose of eliminating tension, softening and fine-tuning the structure, as well as improving the extensive mechanical residential or commercial properties of the welding warmth affected area. Up until now, the world’s innovative ERW devices have normally embraced this method to refine the welds, and also great results have actually been gotten. The high-quality ERW steel pipeline not only can not distinguish the weld, however also the weld coefficient reaches 1, which recognizes the suit in between the weld area and the base metal.
At the same time, the ERW steel pipe has the advantages of using hot-rolled coil as the raw material, and the consistent wall density can be controlled at concerning plus or minus 0.2 mm. The two ends of the steel pipe are in accordance with the American APl requirement or GB/T9711.1 standard. Product as well as various other benefits. Over the last few years, different gas pipeline network projects and also gas business have actually widely embraced ERW steel pipeline as the main pipeline material for urban pipe networks.
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