When there is no defect in the variable diameter joint, the flange is through the steel pipe. At this time, the flange distribution is uniform. When there is defects inside the variable diameter joint, the flange is curved, and some flange leaks the surface of the steel pipe. Detecting the magnetic flux gel escaping the surface of the magnetized variable diameter joint can determine whether the defect is present. The variable diameter joint welding is large, and the crack is easily generated, and different electrodes are used for welding when welding to ensure the quality of the welded variable connector. If the same type of chromium variable diameter joint welding rod is soldered, a cooling treatment of about 300 ° C or higher is less than about 700 ° C. If the weld is not solder heat treatment, the chromium nickel variable diameter joint should be used.
In order to improve the corrosion resistance and weldability of the variable diameter joint, appropriately increase the appropriate amount of stability elements Ti, Nb, Mo, etc., and the weldability is better than the chromium variable diameter joint. Different kinds of electrodes have different performance and characteristics in use, and in use, according to the corresponding needs, to ensure the quality of the welded variable diameter joint. When the vial joint is used in the pump import and exit, the metal variable diameter joint should be mounted between the pump and the pump, and the large diameter of the variable is mounted. When the pipe displacement is ≥ When the compensation amount of the joint is increased, the number of variable diameter joints should be increased to the parallel displacement, which is strictly forbidden to adjust the extraction of the pipeline, so that the disturbance displacement and deviation of the variable diameter joint.
The variable diameter joint uses the elasticity, high gas tightness, medium resistance, weather resistance and radiation resistance, and the polyester curtain of the polyester curtain, the combination of the hot and cold, and has passed high pressure. High temperature molds are vulcanized. When using the same type of chromium stainless steel, a tempering treatment of preheating and 500 ° C after welding of 500 ° C above 200 ° C should be carried out. If the weld is not heat-treated, a chromium nickel stainless steel is used. The pharmaceutical skin of the variable diameter joint has titanium and low hydrogen type. Titanium is used for direct current, but the AC welding is too light, and it is easy to red, so the variable diameter joint uses DC power supply as much as possible.
What is the effect of variable diameter joint?