According to the pipe wall thickness, steel strip made of thin materials such as pipe can use high frequency welding, some thin wall pipe can use the method of shielding gas, welding; Wall Cold Drawn Steel Tubes thickness greater than 2 mm pipe can use manual welding.
According to the size precision of steel tube diameter, small diameter of only one side welding and technicians to implement two sides welding can drilling pipe. One-side welding for welding technique request, can do two one-side welding forming, through ball test, guarantee capacity and weld cross-sectional area have both comply with the design requirements.
As long as the material is alloy steel pipes, including heat resistance, high voltage, low temperature resistant alloy steel tube, are emphatically on the welding process to implement to avoid produce martensite structure due to the welding of high temperature, the tendency of cracks, the craft is general requirements, electrode to choose good, and baking to welder use, according to the requirements on both sides of weld welding before going to oil, water, rust, debris, clean, welding line energy as less as possible, to minimize the swing welding process, after the arrangement of a welding seam annealing heat affected zone for as much as possible. Slow cooling after welding, cover good measures with asbestos cloth, etc.
In order to ensure quality of Cold Drawn Tubes welding, the welder training and exam, qualified mount guard. Welder to weld good precision steel tube, in addition to the basic theory, to hone skills that could contain the downhand welding process, vertical and overhead welding several gesture, choose good to take care of the size of the current to the vertical and overhead welding forming, process control, good arc stability and forming can swing appropriately, combined with good shape and rocking.
When the galvanized pipe storage and transportation needs closely stacked together, you should take some measures to avoid the white rust, keep low humidity environment around the plating parts and ensure adequate ventilation between accumulation of plating, can make the white rust to the less. Specific measures are as follows:
1, the surface treatment method can be used to reduce the coating production of white rust.
2, have good ventilation environment under the condition of adding cover deposit.
3, if plating pieces only precision welded tubes in open air, to supply the free flow of air to the surface of galvanized pipe.
4, covering the plating parts not in could be affected by rain, fog, water and snow water influence.
5, when galvanized pipe need to shipping, should not take it as a surface ship consignment, also should not put it in the ship's bottom, may contact with bottom water.
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