Measures for welding galvanized pipe
First of all, the human factor is the key control point of welding. Therefore, before welding, should choose skilled, holding welder certificate welder, necessary technical training, disclosure. And shall not be replaced at will, to ensure that the welding of the pipeline welder is relatively stable.
The second is the control of welding materials, to ensure that the procurement of regular channels of welding materials, there is a guarantee, certificate of quality, in line with the process requirements; The electrode head recovery control is strict to ensure the flow direction and dosage; Welding materials should be baked strictly in accordance with the process, and no more than half a day at a time.
The third is the welding machine, welding machine must ensure, meet the needs of the process; The welder must have qualified current and voltmeter to ensure the correct implementation of welding process. The welding cable should not be too long. If it is too long, adjust the welding parameters.
Technical requirements for galvanized pipe
1. Brand name and chemical composition
The grade and chemical composition of galvanized steel pipe shall conform to the grade and chemical composition of black pipe steel stipulated in GB/T3092.
2. Manufacturing method
The black tube manufacturing method (furnace welding or electric welding) is chosen by the manufacturer. Galvanizing adopts hot dip galvanizing method.
3, thread and pipe joint
a: Galvanized steel pipe with thread for delivery, the thread shall be turned after galvanized. Threads shall conform to YB 822.
b: Steel pipe fittings shall comply with YB 238; Malleable cast iron pipe fittings shall conform to YB 230.
4. Mechanical properties The mechanical properties of the steel pipe before galvanized shall comply with the provisions of GB 3092.
