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7. The electrode should be connected and dried during the operation of the electrode. The titanium-calcium type should be dried at 150 ° C for 1 hour, and the low-hydrogen type should be dried at 200-250 ° C for 1 hour (can not be dried again and again, otherwise the coating will be easily cracked and peeled off). Beware of the electrode Coating oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the weldment.
8. During welding of stainless steel pipe fittings, carbides are repeatedly heated to precipitate carbides, reducing corrosion resistance and mechanical performance.
The common problems are as follows:
1. Uneven wall thickness of stainless steel pipe fittings
The uneven wall thickness of sanitary stainless steel pipe fittings mainly occurs in the parts where the stainless steel pipe is most deformed, such as the wall thickness at the back of the elbow is thinner than other parts; the wall thickness of the nozzle and the stainless steel pipe body are not the same. In order to check out these problems, calipers and other commonly used measuring tools are not easy to detect. At this time, only an ultrasonic thickness gauge can be used to detect them.
2. Excessive hardness
The problem of excessive hardness is mainly due to the heat treatment process after forming. The solution is to use the correct heat treatment process for another heat treatment.
3. Inspection of stainless steel pipe fittings before delivery and after delivery
As the last process to ensure the quality of sanitary stainless steel pipe fittings, inspection plays an important role, especially for stainless steel pipe fittings that withstand high temperatures and pressures and flammable and highly toxic media.
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