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
Inspection method of high frequency welded pipe1. Chemical composition analysis: chemical analysis method, instrumental analysis method (infrared C—S instrument, direct reading spectrometer, zcP, etc.).A. Infrared C-S instrument: Analyze the C and S elements in ferroalloys, steel-making raw material
Pre-treatment and use of straight seam steel pipePre-treatment of straight seam steel pipe:Non-destructive inspection of the inside of the weld. Because the pipeline belongs to the extra-large steel pipe in the water supply project, especially the steel pipe with a thickness of t=30mm is used as a p
How to solve the deformation problem of spiral seam submerged arc welded steel pipeThe spiral seam submerged arc welded steel pipe is drilled in rotation and begins to enter the soft formation. Under the action of the tri-cone, the drill first produces elastic shear deformation of the stratum and th
Development status and prospects of domestic and foreign oil and gas pipelinesAn important driving factor for the development of oil and gas pipelines is the imbalance in the production and demand of oil and gas resources in various regions. Since the development of the oil and gas industry, most co
Overview:ASTM A234 is the standard specification for pipe fittings of wrought carbon steel and alloy steel for moderate and high-temperature service. The Cr-Mo low alloy steel pipe fittings has been separately listed on our website. Carbon steel pipe fittings manufactured to ASMT A234 are usually fu
