The production process of welding steel pipes is to use various molding methods, such as various molding methods or bending rolls in the required cross -section shape with various forming methods, and then use different welding methods to welded welding with different welding methods with different welding methods. Get the steel pipe. Therefore, the defects of welding steel pipes are divided into two parts: steel plate welding defects and mother material defects.
The weld defect refers to the defects produced in the weld during welding or after welding. It is divided into cracks, pores, residue, unproofed, unloading, bite edges and other welds. The dense stomators and residue in the weld are dense three -dimensional defects. Cracks and unconstituted blends are flat defects and are harmful. Strip -like slag and unpestrated are strip -like defects, which are harmful. Pores, small residue, etc. are point -like defects.
The defects in the weld are more likely to cause the strength and plasticity of the steel pipe, which seriously affects the quality of the steel pipe, and the quality of the welding steel pipes directly affects the safe operation and service life of the oil and gas transportation pipeline. Therefore Detective detection in risk defects such as cracks in the gap, pores, residue, unproof, and unloading.
The defects in the plates have been rolled, and most of them are flat -shaped and parallel to the surface. The main defects are layered, miscellaneous, cracks, folding, etc. The layered is the most common internal defect. The layered will produce a variety of cracks. When the board is perpendicular to the surface stress, the layering will seriously affect the strength of the steel pipe. It is a defect that does not allow existence.
