On-line heating method and device for stainless steel pipe

Abstract

The present invention provides an on-line heating method for stainless steel tubes and a device thereof. The specific steps of the heating method are as follows: S1, placing a strip on a strip conveying device, and starting a stainless steel tube preheating component and a stainless steel tube forming component; S2 . Set n groups of preheating points symmetrically on both sides of the strip; S3. When the strip moves towards the welding area of ​​the stainless steel tube, the induction heating coil starts to heat the left and right sides of the strip, and the X-ray stress detection device starts to detect in real time. For the stress on both sides of the strip, adjust the temperature value or spacing value of the preheating point according to the real-time detection of the stress value of the strip; S4, when the temperature on both sides of the strip reaches the welding temperature of the stainless steel tube, the strip is welded. In the heating device, the induction heating coil preheats the strip, and the temperature sensor and X-ray stress detection device monitor the temperature and stress of the strip in real time. The invention avoids the problem of excessive welding stress, improves the material performance and quality of the stainless steel pipe, and improves the production efficiency of the enterprise.

Description

technical field [0001] The invention relates to the technical field of stainless steel pipe production, in particular to an on-line heating method for stainless steel pipes and a device thereof. Background technique [0002] Stainless steel welded pipes can be used in the manufacture of low-pressure boilers of various structures, replacing some seamless steel pipes, thereby reducing the production cost of low-pressure boilers of various structures, but the level of stainless steel pipe welding directly affects the use of low-pressure boilers. The quality requirements of stainless steel pipes are very strict. Stainless steel welded pipes are generally made of sheets and strips that are crimped and then welded. They can be welded using high-frequency induction current. High-frequency induction welding has fast welding speed, small heat-affected zone, and good welding quality. However, induction welding also has its shortcomings, mainly due to the uneven temperature field gene...

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Problems solved by technology

[0004] In order to solve the deficiencies of the prior art and aim at the problem that the temperature distribution gradient of the stainless steel pipe is too large in the heated weld seam and its heat-affected zone, resulting in excessive welding stress, the invention provides an online heating method and device for stainless steel pipes, The two sides of the strip are preheated by induction heating coils installed on both sides of the frame, and the temperature sensor and X-ray stress detection device on both sides of the strip can monitor the heating condition of the strip and the stress generated during the heating process in real time , by determining the optimal spacing between the induction heating coils to ensure that the stress value is within the allowable range, it can effectively solve the problem of large residual stress in the welding area, thereby improving the material performance and quality of stainless steel pipes, and providing production services for enterprises Improve efficiency

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