steel tube

 Tianjin Xinyue Steel Group is a professional steel pipe mills from Tianjin, China. If you are familier with Chinese steel market, you may know that Tianjin is the base of Chinese steel mills. ERW steel pipe is Xinyue Steel Pipe’s main product. Xinyue can provide outer diameter size from 21.3mm to 660mm. Wall thickness size from 1.5mm to 22.2mm. Main usage for Electric Resistance Welded Steel Pipe are as below: 1. low pressure liquid delivery 2. water, gas, and oil transportation 3. Oil drilling 4. machinery manufacturing, etc. In some countries, people also name ERW steel pipe as High Frequency Induction weld pipe(HFI), Electric Fusion Welded Pipe(EFW),etc. Most common seen standard and steel grade: API 5L : GR B, X42,X46, X56, X60,X65,X70 ASTM A53: GR A, GR B, GR C EN: S275, S275JR, S355JRH, S355J2H GB: Q195, Q215, Q235, Q345, L175, L210, L245, L320, L360- L555 Surface Treatment: Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating or...

 　　1) The influence of welding current on weld formation 　　Under certain other conditions, with the increase of arc welding current, the weld penetration depth and remaining height increase, and the penetration width increases slightly. The reasons are as follows: 　　1. As the arc welding current increases, the arc force acting on the weldment increases, the heat input of the arc butt weldment increases, and the position of the heat source moves down, which is beneficial to the conduction of heat to the molten pool and increases the penetration depth. The penetration depth is approximately proportional to the welding current, that is, the weld penetration depth H is approximately equal to Km×I, where Km is the penetration coefficient (the number of millimeters that the welding current increases by 100A causes the weld penetration to increase), which is related to the arc welding method , Wire diameter, current type, etc. 　　2. The melting speed of the core or wire of arc welding is p...