What are the precautions for the specific use of stainless steel flanges1. To prevent the corrosion between the eyes due to the heating of the flange cover, the welding current should not be too large, about 20% less than the carbon steel electrode, the arc should not be too long, the interlayer coo

Safety management of spiral steel pipeTo solve the problem of misalignment in the alignment of spiral steel pipe nozzles, the following preventive measures should be taken in the quality management control:1. Try to use the internal alignment device.2. Do engineering measurement and trimming work du

How to improve the wall thickness accuracy of reinforced 3pe anticorrosive steel pipe?1. For the heating of the tube billet, it is necessary to pay attention to uniform heating, prohibit rapid temperature rise and fall, and keep the temperature rise and fall smoothly.2. Use the centering roller to d

Common Defects in Welding Area of Spiral Submerged Arc Welded Steel PipeDefects that are easy to produce in the submerged arc welding area are pores, hot cracks, and undercuts.1. Bubbles. Bubbles mostly occur in the center of the weld bead. The main reason is that hydrogen is still hidden inside the

How to judge the quality of spiral welded steel pipe1. From the surface of the spiral steel pipe, see whether the production process of the spiral steel pipe is superb. Generally, it is necessary to study and analyze spiral steel, and the cross-section of counterfeit spiral steel pipe is elliptical.

Causes of slag inclusion in longitudinally welded steel pipes and cutting methodsSlag inclusions in longitudinally welded steel pipes are slag remaining inside the weld. From theoretical analysis, the main reasons for slag inclusion in submerged arc automatic welding are as follows: ①There are more

Pre-welding of straight seam steel pipe:Pre-welding includes seams and welds.1. The joint seam (that is, the forming seam) has no wrong edge or the wrong edge is less than the specified value. Generally, the amount of the wrong edge is less than 8% of the plate thickness, and the maximum is not more

The cause and adjustment of uneven steel pipe wall thickness1. Uneven spiral wall thickness is caused by: the uneven wall thickness caused by the adjustment of the piercing machine's rolling centerline, the inclination of the two rolls, or the reduction of the front head is too small, generally alon

Reasons and advantages of steel welding for large-diameter steel pipes1. The use of large-caliber stainless steel can be divided into oil well pipes (casings, oil pipes, and drill pipes, etc.), line pipes, boiler pipes, mechanical structure pipes, hydraulic prop pipes, gas cylinder pipes, geological

Causes of trachoma in the weld of spiral seam submerged arc welded steel pipeThe spiral steel pipe is made by bending the steel strip in the spiral direction through the coiling machine, and then through the double-sided submerged arc welding of the capacitor. In the production process of spiral ste