News
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ERW oil casing application and market analysis
In the field of oil drilling and oil well, high-frequency electric resistance welded casing (referred to as ERW casing) compared with seamless casing is high dimensional accuracy, weld toughness, anti-extrusion of high-performance, and low cost advantages, which has been widely used in foreign co...Read more -
Large-diameter LSAW Steel Pipe Production Process
Large-diameter LSAW steel pipe production process mainly explained: 1. plate probe: used to manufacture large diameter submerged arc welded steel pipe joints straight after entering the production line, the first full-board ultrasonic testing; 2. Milling: Milling machine through the two-sided edg...Read more -
Tube Billet Heating Defects and Its Prevention
Hot-rolled seamless steel pipe from the tube to the product generally requires two heating, which perforated tube before and after heating and rolling blank pipe diameter at a given pre-heating; production of cold-rolled (pull) when the pipe requires the use of an intermediate annealing to elimin...Read more -
Spiral Weld Seam
Spiral weld seam has the following several types: 1. Spiral strip end weld: steel head that spiral weld on steel or steel weld head and tail; 2. Two spiral butt weld: spiral cut is to link the two together to form an annular weld; 3. Spiral tack welding: that is applied before the final welding. ...Read more -
Production of Cold Drawing Petroleum Cracking Tube
Production of cold drawing petroleum cracking tube can be cold-rolled, cold drawn, cold-drawn, cold-mix production. Using drawing process, a simple equipment, low investment, easy operation and maintenance and so on. But the drawback is the middle step of many, lumber rate. Using cold process equ...Read more -
Cause of the Welds in Trachoma
Spiral Pipe(ssaw steel pipe): by strip by roll forming machine, folding spiral direction, and then double-sided submerged arc welding is made through a capacitor. Spiral welded steel pipe production process, prone to leakage in many cases, such as welding and the wrong side. However, in these cas...Read more