1. Before molding work
Raw materials that strip, wire, flux. We must go through rigorous physical and chemical testing before it is put. Strip head and tail docking, single or double wire submerged arc welding, in rolled steel by automatic submerged arc welding.


2. The molding process
Electric contact pressure gauge to control both sides of the conveyor pressure cylinder pressure to ensure the smooth delivery of the strip, the host is centrally located, so you should always check to adjust the vertical roll (especially around the head), to ensure delivery of the strip edges strict according to the process specified route runs through the meshing point design. By external or internal control roll forming, checking the perimeter, pipe ovality, straightness and other compliance standards, do not meet the requirements, will have to continue to make adjustments until the desired date.


3. The welding process
The weld gap control device to ensure the weld gap to meet the welding requirements, diameter, the wrong side and the weld gap have been strictly controlled, should continuously observe the quality of the molding seam, found the wrong side, slotted, etc. should be after the bridge in time to fine-tune the angle, forming quality assurance; when exceptional circumstances should check the working width of the strip, the edge pre-bending condition, the delivery line position, with or without small change in roll angle, and to take timely corrective action. Hebei straight seam welded steel pipe manufacturers currently inner and outer welding are used by the US Lincoln welding machine for single or double wire submerged arc welding, thereby obtaining a stable welding quality. Straight seam steel pipe manufacturers should continuously observe the quality of the molding seam, found the wrong side, slotted, etc. should be fine-tuning the angle of the rear axle, to ensure the quality of the molding; when exceptional circumstances should check the working width of the strip, the edge pre-bending status, delivery line position, small roll angle without changes, and to take timely corrective action.


4. Detection
After welding the weld line continuous ultrasonic injury checks to ensure 100% coverage of non-destructive testing of spiral weld. If defective, automatic alarm and spraying tags, production workers so adjusting the process parameters, and remove defects.


5. Packaging library
Pipe end machining, so that the end vertical, bevel and blunt edge be accurately controlled. Using air plasma cutting machine will cut a single tube. Blade with a blunt or damaged, it should be immediately replaced with new blades and new blade before use stone must be polished blade tip can not use grinders grinding. After application whetstone grinder grinding again before use after grinding blade defect.