Welding process for hydraulic system piping installation
The welding procedure for the hydraulic system piping installation of the hydraulic system piping installation is as follows: Special Rock Wool Board For Curtain Wall Special Rock Wool Board For Curtain Wallis an inorganic fiber board made of basalt as the main raw material through high temperature melting processing. It was successfully tested in June, 1981. Rock wool board is a new type of thermal insulation, flame-proof and sound-absorbing material. Rock Wool Board Curtain Wall,Rock Wool Curtain Wall Board,Special Rock Wool Board,Rock Wool Board For Curtain Wall Zhengzhou Ou Nuo Building Materials Co., Ltd. , https://www.yuounuo.com
1. The welder of the welded hydraulic pipeline shall hold an effective high-pressure pipeline welding certificate.
2, the choice of welding process: acetylene gas welding is mainly used for the general carbon steel pipe wall thickness of 2mm or less. Arc welding is mainly used for pipes with a carbon steel wall thickness greater than 2 mm. The welding of the tubes is preferably argon arc welding. Pipes with a wall thickness greater than 5 mm shall be grounded by argon arc welding and filled by arc welding. If necessary, the pipe hole should be filled with a protective gas method for welding.
3. The welding rod and flux should be matched with the welded pipe. The grade must have clear evidence, and there is a product certificate, and it is within the effective use period. The electrode and flux should be dried according to the product specifications before use and kept dry during use and used on the same day. The electrode coating should be free of detachment and significant cracks.
4, hydraulic pipe welding should use butt welding. Before welding, the surface dirt, oil stains, moisture and rust spots at the groove and its vicinity should be removed.
5. The welding of the pipe and the flange should be made by butt welding flange, and the insert flange should not be used.
6. The welding of pipes and pipe joints shall be butt welding, and shall not be in the form of plug-in.
7. Pipes and pipes should be welded by butt welding. Plug-in welding is not allowed.
8. When the hydraulic pipe is butt welded, the inner wall of the weld must be 0.3~0.5mm higher than the pipe. It is not allowed to appear concave inside the wall. After welding, use a shovel or a hand-held grinding wheel to level the weld in the inner wall. Remove the welding slag and burrs to achieve a smooth finish.
9. The cross section of the butt weld should be perpendicular to the centerline of the pipe.
10. The weld cross section is not allowed at the corner and should be avoided between the two bends of the pipe.
11. When welding the pipe, it must first be spot-welded according to the installation position, then removed and welded, and then assembled and shaped after welding.
12. During the whole process of welding, wind, rain and snow should be prevented. After the pipe is welded, the weld bead with a wall thickness of 5 mm or less shall be naturally cooled at room temperature, and shall not be forced to cool with strong wind or water.
13, the weld should be welded through, the appearance should be even and even. The weld of the pressure pipe shall be inspected by sampling.
14. After the pipe is welded, all pipes should be pre-installed once according to their location. Connect each hydraulic component, valve block, valve frame, and pump station. Each interface should be naturally attached and centered, and cannot be twisted and connected. When the pipe joint or flange screw is loosened, there is no large misalignment, separation or corner angle of the center of the joint surface. If this happens, it can be eliminated by fire roasting.
15. The pipe clamp can be welded to the frame after all the piping is completed, or it can be carried out as required.
16. After piping, welding, and pre-installation, the pipe is disassembled again for pickling and phosphating. After pickling and phosphating the pipeline, hot air is introduced into the pipeline for rapid drying. After drying, if it is reinstalled into a system in a few days, the hydraulic oil is introduced into the pipe. Generally, it can be rust-proof, but it should be kept safely. If it is necessary to put it on for a long time, it is necessary to apply anti-rust paint, it must be painted after 48 hours of phosphating. It should be noted that the rust preventive paint must be compatible with the cleaning fluid or the hydraulic fluid used in the subsequent pipe cleaning.
Before the pipe is re-installed after pickling, phosphating, and drying, a pre-cleaning of the inner wall of each pipe is required. After the pre-cleaning is completed, it should be reassembled into the system as soon as possible to carry out the overall cycle purification treatment of the system until the cleanliness level required by the system design is reached.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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