welding is carried out in the welding technological requirements.doc

Welding is carried out in the welding technological requirements, including the welding method, welding material, welding specification (current, voltage, energy), welding sequence and welding deformation and temperature control. (2) the weld defects Multi-layer welding interlayer exists defects such as cracks, porosity, slag inclusion, defect is cleared. (3) the welding equipment Welding equipment operation is normal, including welding power supply, wire feeding mechanism, roller frame, flux bracket, cooling device, running gear, etc. For large oil storage tanks, for example, side plate and side slabs seam welding, in order to reduce the deformation of floor surface for seam welding, welding inspection is particularly important. Welding in the welding test should be according to the following procedure: 1. The first pass local processing, if discover creates stress due to welding deformation cracks on butt weld root, application of carbon arc air gouging or polishing machine for a thorough treatment, and PT inspection qualified can be carried out only after the next step work arrangement, the inspection work is especially important for large storage tank. 2. Spot welding: at the end of the welding work above, the side surface outlet can produce buckling deformation in different degrees, make originally joint tight clearance between side plate and plate, must check before spot welding processing. 3. Welding: all side slabs seam after welding, and welding. Second, the inspection after welding (a) visual inspection 1. The use of low power magnifying glass or whether there is a macroscopic observation of weld surface bite edge, slag inclusion, porosity, surface defects such as cracks. 2. Use welding inspection ruler, measure the weld residual high, flash, sag hi-lo, etc. 3. Check whether welding deformation. For example, large vertical cylindrical storage tank welding appearance inspection requirements, bite side of the butt weld depth, shall not be greate