With the continuous progress of industrial technology, all kinds of pipes have made great progress and enrichment in quality and variety, among which pe pipe is one of the representatives. At present, pe pipe manufacturers are mostly small and medium-sized enterprises, and their sales methods are mostly local markets, so they also have a strong regional color. Like other industries, although there are many differences in product categories, pe pipes have gradually formed a unified construction technology in the industry in welding technology.

A, pe pipe preparation before welding

1) Clamp the socket ends of pipes and fittings on the butt welding machine and clean the socket ends.

2) Move the movable fixture, plane the connection surface of the pipe and pipe fittings on the milling cutter, take off the milling cutter and check the connection surface of the pipe end, so that the maximum clearance is not greater than 0. Three millimeters.

3) Straighten two corresponding parts to be connected on the butt welding machine so that they are on the same axis, and the offset should not be greater than 10% of the wall thickness.

4) Place the heating tool between the two connecting surfaces. Make the pipe on the butt welding machine close to the heating tool and apply a certain pressure to melt directly, forming a smooth and symmetrical flanging along the whole outer circumference of the pipe.

5) After heating, the joint to be connected should be quickly separated from the docking heating tool, and uniform external force should be applied to make it completely contact to form a uniform flange.

Second, the pe pipe welding operation steps

When welding (1)PE water supply pipe, center the axes of the two pipes and fix the two pipe ends by spot welding.

(2) When the PE water supply pipe is welded to the flange, the water supply pipe should be inserted into the flange first, then aligned with a square after spot welding, and then welded after leveling. Flange should be welded on both sides, and the welding on the inner side should not protrude the sealing surface of flange.

(3) When the wall thickness of PE water supply pipe is above 5mm, grooves should be cut to ensure full penetration. The groove can be formed by gas welding cutting or beveling machine, but the slag and iron oxide should be removed and polished with a file until the metallic luster is exposed.

(4) When cutting the steel pipe, the cutting surface should be perpendicular to the center line of the pipe to ensure the concentricity of the welded pipe.

(5) Flanges shall be perpendicular to the center line of the pipeline and their surfaces shall be parallel to each other. Flange gaskets should not extend into the pipeline. The bolt specification of the connecting flange should match the flange, and the length of the screw protruding from the nut should not be greater than 1/2 of the screw diameter.

(6) When welding the water supply pipe, the floating rust, dirt and grease on the pipe joint should be removed.

(7) Flange gaskets shall be selected according to the requirements of drawings and specifications. Rubber gasket should be used for cold water system and asbestos rubber gasket should be used for hot water system.

Many people may not know much about pe pipes. Generally, such pipes have been used in our daily life, such as our window guardrails, roads and bridges, roof advertising display racks and so on. The welding technology of pe pipe also directly affects the safety and service life, so the requirements for industry technicians are constantly improving. For small enterprises, it is also necessary to increase the training of technicians, improve the skills of employees, maximize the efficiency of products, and ensure the welding project.

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