As the Stainless Steel Pipe Fittings pieces of different sizes, according to the unique place of Stainless Steel Pipe Fittings welding, as far as possible to reduce the amount of heat input, so the use of manual arc welding, argon arc welding two methods, d> Φ159 mm using argon arc welding, Arc welding cover. D ≦ Φ159 mm full use of argon arc welding. Stainless Steel Pipe Fittings welding technical requirements are as follows:
① manual arc welding when the use of direct reverse welding machine, argon arc welding with DC is followed;
② welding should be welded with stainless steel wire brush off the surface of the oxide, and acetone washing; electrode should be 200-250 ℃ drying 1h, with the take with;
③ before cleaning the workpiece groove on both sides of the 25 mm range of oil and other clean, and with acetone wash on both sides of the 25 mm range;
④ argon arc welding, the nozzle diameter Φ2 mm, tungsten pole bowl tungsten, specifications Φ2.5 mm; ⑤ TIG welding stainless steel, the back must be filled with argon protection, in order to ensure the back of the forming. Using the method of partial argon in the pipeline, the flow rate of 5-14L / min, positive argon flow rate of 12-13L / min.
When welding the thickness of the weld should be as thin as possible, and the root fusion outstanding, when the arc into a slow slope, if the arc shrinkage, the application of grinding machine wear off. Must be arc in the groove arc, arc should be filled with craters, to prevent cracks in the arc.
As the Stainless Steel Pipe Fittings fittings for the austenitic Stainless Steel Pipe Fittings, in order to prevent carbide precipitation and intergranular corrosion, should strictly control the inter-layer temperature and post-weld cooling rate, the requirements of welding between the inter-layer temperature control below 60 ℃, after welding Immediately water-cooled, while the use of sub-welding. This symmetrical dispersion of the welding sequence, you can increase the joint cooling rate, but also reduce the welding stress.
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Stainless Steel Pipe Fittings is a more widely used a new type of pipe fittings, in general, the processing methods are as follows:
1, forging method: the use of forging machine to the end of the tube or a part of the extension, so that the outer diameter reduction, commonly used forging a rotary, connecting rod, roller type.
2, roller method: placed in the stainless steel tube core, the external use of roller pressure, the round edge processing.
3, stamping method: the punch with a taper on the core of the pipe end to the desired size of the required shape can be.
4, bending forming method: there are three methods are more commonly used, one method called stretch method, another method called stamping method, the third roller method, there are 3-4 rollers, two fixed roller, a roller adjustment, adjust Fixed roller distance, finished pipe is bent.
5, rolling method: generally do not have mandrel, suitable for thick-walled tube inside the round edge.
6, bulging method: one is placed in the tube rubber, the top with a punch compression, so that the tube protruding shape; another method is the hydraulic bulging shape, in the middle of the tube filled with liquid, the liquid pressure to the drum drum into the required Shape, the production of bellows most of the use of this method.
Stainless Steel Pipe Fittings fittings, especially the tee, elbow and the size of the first in the pipeline construction process more and more common, mainly because of its good shape, pressure and strong, simple welding and other characteristics to ensure that the pipeline Pressure capacity, so in the process of pipeline engineering, especially in petrochemical and other high temperature and high pressure and flammable and explosive pipes, the rational use of pipe fittings and the quality of the pipe itself is directly play a pivotal role.
Because of this, in the pipeline design, installation process, especially in the petrochemical industry, high temperature and high pressure and flammable and explosive pipeline project, whether from the design selection or processing, until the construction and installation of each link, design and manufacture and The installation unit personnel to strictly check to ensure that its selection, timber, manufacturing, installation and inspection of the quality, or in the installation and production process will cause difficult to assess the loss.