R134 refrigerant tube

99%, belonging to a relatively minor link.1. Therefore, before the Charging Pipe welding of the steel strip, the surface quality and the geometric dimension of each steel strip should be checked. Such as the roll is not well adjusted, easily lead to the seam of steel pipe joints, lap welding, edge waves, drum kits and pipe body surface with indentation or scratches, steel ovality and other defects, therefore, roll change should master roll adjustment skill. If the quality of the steel strip does not meet the standard requirements, do not conduct the production so as to avoid unnecessary losses. The bite edge of the strip (ie, the jagged edges of the strip appear to be uneven), usually appear in the slitting belt, resulting from the blunt or sharp edge of the slitting disk blade. Raw materials on the quality of steel weldingCausal analysis results of steel pipe scrap show that the main factors that affect the quality of raw materials are the mechanical properties of steel strip instability, steel strip surface defects and large geometric deviation of the three aspects, therefore, should focus on control from these three aspects. The roll material, equipment failure, the production environment and other factors in four aspects, the impact on the quality of steel products accounted for 19. Roll adjustment of the impact on the quality of steelCausal analysis of pipe scrap from the figure can be seen, the roller adjustment is a steel r410a refrigerant recharge kit pipe operating process. When the width of the strip is less than the allowable deviation, the squeezing force decreases when the steel pipe is welded, so that the welding of the steel pipe weld. High-frequency welding on the quality of the pipeIn the process of high-frequency welding of steel pipes, the welding process and process parameters control, the placement of induction coils and the position of the impellers have a great influence on the welding quality of the steel pipe welds.2.3.01%. For the requirements of the same section wall thickness difference does not exceed the specified value of the steel pipe, which requires a high degree of uniform thickness of the steel pipe, strip thickness fluctuations will be the same volume of steel strip thickness difference exceeds allowable value transferred to the finished steel pipe wall thickness difference, so that a large number of pipe thickness beyond the allowable deviation and sentenced to waste. At this time should be adjusted roll in order to obtain a good quality steel. Therefore, the fluctuation of the strip width not only affects the accuracy of the outer diameter of the steel pipe, but also seriously affects the surface quality of the steel pipe. In the production process, the roll damaged or worn serious, the need to replace part of the roll on the unit, or a continuous production of a sufficient number of species, the need to replace the entire roll. .Statistics show that in the production process, the main factors that affect the quality of erw pipe products are raw materials, welding technology and roll adjustment.When the width of the steel strip is larger than the allowable deviation, the extrusion force increases when the steel pipe is welded, and weld defects such as sharp beak, lap or burr appear in the weld of the steel pipe. Steel pipe weld gap control steel strip into the welded pipe unit forming roll forming, the orientation of the guide roller, the formation of a circular gap with the open pipe, adjust the squeeze squeeze the amount of rollers, making the weld gap control in 1 ~ 3mm, and the weld two Keep it flat. Therefore, in the steel pipe production process, the raw materials, welding process and roll adjustment of the three aspects of key control. Due to the bite of the steel strip, there are local lack of meat from time to time, so that when the strip is easy to produce cracks in the welding, cracks and affect the stability of the weld quality. In the pipe forming process, the sickle bend and wavy strip will lead to the deviation or overturning, easy to produce welded steel pipe weld, affecting the quality of steel. Weld gap control is too large, will make the welding seam bad fusion and cracking; weld gap control is too small, due to heat is too large, causing the weld burning, molten metal splash, affecting the welding quality of the weld. The sum of the three effects on the quality of steel pipe products accounts for 80.In addition, due to the existence of steel sandwich, impurities, trachoma and other material defects, but also affect the quality of steel is an important factor. The fluctuation of the thickness not only affects the thickness accuracy of the finished steel pipe, but also makes the quality of the weld unstable when the steel pipe is welded, because the thickness of the steel strip is different, which causes the steel pipe to be unstable in the welding, the pressing force and the welding temperature. Strip surface defects are common sickle bend, wave-shaped, longitudinal nibbling and so on, sickle bend and wavy generally appear in the cold-rolled strip rolling process, is caused by the control of the amount of reduction

Spiral welded pipe production process is in accordance with the appropriate helix angle of low-alloy structural steel and low-carbon carbon steel rolled into a tube, and then welded pipe forming.Welding is the use of proximity or flux under the burning of the arc and skin effect, heating the edge of the tube and to melt, in the appropriate extrusion under the cooling molding. It is the most significant feature of spiral steel pipe which can produce large diameter steel pipe with narrow billet.

The cleaning of the high frequency straight seam steel pipe can only be used as an auxiliary means in the anti-corrosion treatment because the cleaning method can only remove the residual organic matter such as dust, grease and lubricant on the steel surface, and can not play the anti-corrosion effect, The same can be the surface of the dirt washed, most of the bacteria still remain in the hands. Longitudinal submerged arc welded pipe and high frequency straight seam welded pipe is different from the edge of the tube melting method, the general use of arc melting is called straight seam submerged arc welded pipe, and high-frequency straight seam welded pipe is the use of high-frequency current melting.

There are four common methods of derusting, namely pickling, cleaning, spraying rust and tool derusting. . Spiral submerged arc welded pipe is the main form of spiral welded pipe. It is widely used in the construction of gas pipeline in all walks of life. can be completely removed, but the steel surface attached to the solid Scaling is powerless and can not achieve the standard anti-corrosion effect.In order to reduce the coating quality, the type of layers and the construction environment factors on the life of the longitudinal seam welded pipe life, to regularly on the straight seam welded pipe rust. Professional and technical personnel with wire brush and other cleaning tools to polish the surface of the workpiece, this method is known as the tool rust, loose rust, welding slag and oxide, etc. Spraying rust is the use of steel sand, steel balls and other high-quality abrasive through the jet of a strong centrifugal force to the straight seam steel pipe surface spray, not only can effectively remove the surface of the dirt, rust and oxide, roughness should be abrasive And the straight seam welded pipe under the friction to achieve the standard level. Pickling is one of the most commonly used methods of derusting, not only as a sandblasting and dehumidification after the re-treatment process, but also the surface of the long-welded pipe rust, oxide, dilapidated coating completely removed, although this cleaning method Can make the steel surface roughness and cleanliness have reached the standard requirements, but after all, is Refrigerant Dosing Meter hanging hook the chemical cleaning method, the surrounding environment is likely to cause pollution

Excellent resistance to immersion in salt-water, above ground extreme temperature swings and abrasive wear and tear.More information,pls visit:Hunan great steel pipe co.,ltd . Since the total performance of a pipe coating system involves the three separate processes, application to the pipe, handling and storage of the pipe, and in-ground or above-ground service of the pipe; the functional requirements and the resistance to deterioration should be considered when establishing your criteria for the coating properties that we offer. This coating is black in color. Primarily used for road bore casings and other casing pipes. Our bituminous asphalt coating has been tested to meet ANSI-A21.Bituminous Asphalt CoatingThe principal uses for asphalt coatings include internal and external application to carbon steel pipe.4 and AWWA C104 specifications for potable water, and has been found to be acceptable and is certified to NSF Standard wholesale R134 refrigerant tubes Manufacturers 61.Bare steel pipe is different from coating steel pipe, bare steel pipe will eventually corrode, or rust. When applied correctly, this fast coating process provides the cathodic protection required for most underground structural steel pipe. This is the least expensive method we offer for pipe coating for cathodic protection, and we are able to provide reliable response times because this is the least complicated coating process that we offer.Epoxy Coating – Sprayed ApplicationTypical applications include heavy-duty service conditions such as chemical plants, bridge piling structures, and Straight Core Manufacturers pipelines