Before welding, the deformed and damaged part of the lower pile pipe must be trimmed, and the rust, water or oil sludge sand at the end of the upper pile pipe must be removed and polished.Make good welding joints so that the gap between the upper and lower piles is 2 ~ 4mm. At the same time, multi-layer welding is used. After each layer of welding seam is welded, the welding slag should be removed in time, and the appearance inspection should be carried out.Add welding block to strengthen the connection of the upper and lower piles. After welding, it must be cooled for more than 5 minutes before hammering and piling.3. Welded pile coverAfter the construction of the pile-driving spiral pipe pile is completed, sand is manually poured into the pile to the top of the pile, and the pile cover is welded on the upper part of the steel pipe pile, and at the same time, 8 to 12 anchor steel bars of 20 mm are welded on the outer wall.Pile driving spiral pipe production process:(1) The raw materials are strip steel coils, welding wires, and fluxes. Strict physical and chemical inspections are required before investment.(2) Butt joint of strip steel head and tail, using single wire or double wire submerged arc welding, after coiling into steel pipe, automatic submerged arc welding is used for repair welding.
(3) Before forming, the strip undergoes leveling, edge trimming, edge planing, surface cleaning and conveying, and pre-bending treatment.(4) The electric contact force meter is used to control the pressure of the cylinders on both sides of the conveyor to ensure the smooth conveying of the strip.(5) Externally controlled or internally controlled roller molding is adopted.(6) The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the weld gap are all strictly controlled.(7) Both internal welding and external welding adopt American Lincoln electric welding machine for single-wire or double-wire submerged arc welding, so as to obtain stable welding quality.(8) The welded seams are all inspected by the online continuous ultrasonic automatic flaw instrument, which guarantees 100% non-destructive testing coverage of the spiral welds. If there is a defect, it will automatically alarm and spray the mark, and the production workers will adjust the process parameters at any time according to this to eliminate the defect in time.(9) Use an air plasma cutting machine to cut the steel pipe into individual pieces.(10) After cutting into a single steel pipe, each batch of steel pipes must undergo a strict first inspection system to check the mechanical properties, chemical composition, melting condition of the weld, the surface quality of the steel pipe and the non-destructive inspection to ensure that the pipe manufacturing process is qualified. Only later can it be officially put into production.(11) The parts with continuous sonic flaw detection marks on the welds are re-examined by manual ultrasonic and X-ray.eliminate.
(12) The pipes where the butt-welded seams of Fe-steel and the J-joint intersecting with the spiral welds are all inspected by X-ray television or filming.(13) Each steel pipe China wholesale aluminum welding machine manufacturers undergoes a hydrostatic pressure test, and the force adopts a radial seal. The test pressure and time are strictly controlled by the steel pipe hydraulic microcomputer detection device. The test parameters are automatically printed and recorded.(14) The pipe end is machined to accurately control the verticality of the end face, the bevel angle and the obtuse edg.Tips: ERW welded pipe is formed by rolling strip and welding the seam, with tighter dimensional tolerances and less weight. The weld seam is heat treated after welding that no untempered martensite remains, and the weld flash can be removed from both inner and outer surfaces. ASTM A53 ERW steel pipe is a typical carbon steel pipe. It is largely used to convey fluids at low / medium pressures such as oil, gas, steam, water, air and also for mechanical applications.
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