Method of Welding Tube Maintenance

The welding tube plays an important role in the construction of the city and the drainage and power plant.General requirements straight astm a53 erw steel pipe on the surface of the tube to nearly white level Sa2.5 practice has proved that in the straight seam welding intervene with a common, vinyl, epoxy phenolic anticorrosive coatings, such as construction technology. Using the descaling grade removes almost all of the scale, rust and other debris and anchor pattern depth of 40 ~ 100 microns to fully satisfy the requirement of the anticorrosive layer and steel adhesion, and shot derusting spray (cast) process can be used with low running cost and stable and reliable quality level to nearly white, certain rust occurs when the straight seam welded pipe, processing according to certain rust removal way and method, ensure the quality of the straight seam welded pipe and performance, can be used in different industries and fields, making important contribution and role for building industry.

Usually in order to achieve the ideal cleaning effect, should according to the appearance of hardness, straight seam welded pipe equipment requirement of original corrosion level, surface roughness, coating types to choose abrasive, such as for single layer, layer or three layer PE coating epoxy, using a mixture of steel shot and steel grit grinding are more likely to achieve ideal cleaning effect.Steel pellets have the effect of reinforcing steel surface, while steel sand has the effect of etching steel surface.Steel shot and steel grit mixed abrasive, usually the hardness of steel shot to 4050 HRC harder to 5060 HRC can be used in all kinds of steel surface, even in the class C and D corrosion of steel surface, cleaning effect is very good also.Straight seam welded pipe derusting abrasive rate per unit time is applied to steel tube, the total kinetic energy E and single grain steel pipe derusting abrasive the kinetic energy of the E1 speed depends on the type of abrasive and abrasive emissions.Type: the amount of spray (cast) of m abrasive;V abrasive running speed;The mass of the m1 particle abrasive.The size of m is related to the grinding rate of abrasive, and the rate of breakage affects the interest and the cost of the equipment.When the device is fixed, m is constant, y is constant, so E is a constant, but as a result of abrasive, m1 change, therefore, generally should choose the abrasive attrition rate is low, so clear to improve speed and long blade life.

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