Recently, an old customer in Pakistan asked me about a problem that many people in the industry have encountered, that is, the pipe produced by the pipe making machine is very straight, but after polishing, it becomes bent. What is the matter, and what should be done to solve it?

Different welding engineers have different ways to deal with this problem, and the reasons for subdividing it are also different. I have simply summarized it. It can be roughly divided into the following three reasons. At the same time, there are three corresponding solutions according to the three reasons. Today, GXG technology will share our daily experience with you.

The first is the deviation of the weld, because the deviation of the weld will lead to the spiral of the weld. The stress of the pipe is different, and the polishing machine may increase the additional stress when grinding, so that the pipe becomes bent. The corresponding solution is to adjust the weld so that the weld is always in a straight line, so that the bending of the pipe will be reduced when it is polished again.

Another reason is that the pipe is straight when it is produced by the pipe making machine, but it bends when it is polished. I heard some engineers say that as long as the pipe is not too straight when it is made, it will return to a straight state after polishing, which means a little negative, but I still can't understand the specific reason, but this is one of the ways.

The last one is the rear section of the pipe making machine, that is, the welding pipe mold of the sizing and straightening structure and the insufficient extrusion of the pipe, resulting in uneven stress on the surface of the pipe, so uneven heating will occur during polishing, which will lead to uneven stress and bending. The solution is to increase the extrusion force of the rear mold on the pipe, and try to make the stress on the surface around the pipe uniform, which can also be well handled.

The bending of pipes after polishing is generally thin-walled pipes and small-diameter thick walled pipes, so you should pay attention to the production of these two kinds of pipes in the future, and do a good job in the cooperation between pipe making and polishing. Finally, I wish every customer of pipe rust steel technology is up to standard and satisfied.

Key words:GXG technology

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