When welding pipe equipment, often encounter welding pipe seam problem, what is seam? That is, in the welding process, the steel pipe weld can not be welded together, leading to the phenomenon of substandard quality. Generally, the length of the slit is more than a few centimeters or longer, which causes the welding pipe equipment to crack?
The main reason for the opening of welded pipe equipment is the material problem, most of which is caused by the chemical composition of raw materials. Although in the process of welding, all are carried out in accordance with the normal steps, in the process of sizing the pipe, there is a cracking state, or we see that the crack of the weld deviates from the center of the weld, and the irregular crack formed by the edge of the base metal is purely caused by the chemical composition of the raw material!
The magnetic bar is the magnetic field generated in the process of welding the tube billet, which will lead to high step frequency current concentrated in the weld "V" shaped area, so that the weld reaches the high temperature point in a very short time, the opening caused by the magnetic bar has obvious characteristics, that is, the weld is black and red, and there is no spark splash, and the weld is fully open. Sometimes, although the surface appears to have completed the welding process, it is not actually 100% complete.
Then there is the pass wear, accompanied by the wear of the extrusion roll pass, the size of the pass gradually increases. When the hot rolled steel strip is used as the raw material for welding pipes and the width of the steel strip is negative deviation or slight pulling, the weld will have quality problems, either resulting in sand holes and no internal welding ribs, or resulting in slit pipes. Therefore, it is necessary to check the internal burr of the welded pipe frequently, increase the extrusion amount of the extrusion roll, or replace the new pass.
Finally, the cause of cracking of welded pipe equipment is bearing damage. In the welding process, although the bearing of the extrusion roll is slightly damaged, it will form weld quality problems such as trachoma tube and lap welded pipe. If the bearing is seriously damaged, the extrusion roll will lose the extrusion pressure on the weld of the tube blank. At this time accompanied by other quality accidents, at this time we can also observe the bearing damage of the extrusion roll, the swing amplitude will increase with the degree of bearing damage.
Every time the finishing tube is rolled, it must go through the process of solution treatment. Ta ensure that the performance of the steel pipe meets the technical requirements. and to provide guarantee for the post-process processing or use. Bright solution treatment process of ultra-long seamless steel pipe has always been a difficulty in the industry.
Traditional electric furnace equipment is large,covers a large area, has high energy consumption and large gas consumption, so it is difficult for realize bright solution process. After years of hard work and innovative development, the use of current advanced induction heating technology and DSP power supply. Precision control of heating temperature to ensure that the temperature is controlled within t2C,to solve the technical problem of inaccurate induction heating temperature control. The heated steel pipe is cooled by "heat conduction"in a special closed cooling tunnel, which greatly reduces the gas consumption and is more environmentally friendly.
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