Indirect measurement and online regulation and control method for welding temperature of H-shaped steel

Abstract

The invention discloses an indirect measurement and online regulation and control method for the welding temperature of H-shaped steel. The method comprises the following steps: (1) setting the initial production speed V and the initial power output power P; (2) setting M * (2n + 1) points, and collecting position parameters; (3) collecting the temperature of a point to be measured; (4) constructing a heat transfer model, and solving the temperature of corresponding points on the inner surface of the H-shaped steel upper wing plate; (5) constructing an interpolation model; (6) calculating an axial interpolation temperature and a transverse interpolation temperature through an interpolation model; (7) judging whether an interpolation result is credible or not according to the axial interpolation temperature and the transverse interpolation temperature, if so, solving a temperature value at a welding point and executing the step (8), and if not, returning to the step (4) to correct the heat transfer model; (8) judging whether the temperature of the welding point is within the optimal welding temperature range or not, if yes, executing the step (9), and if not, adjusting the power supply power and the production speed; (9) detecting whether a production stopping signal is input or not: if so, stopping circulation, and if not, returning to the step (2) for closed-loop monitoring.

Description

technical field [0001] The invention relates to the field of H-shaped steel, in particular to an indirect measurement and on-line regulation method of the welding temperature of the H-shaped steel. Background technique [0002] H-shaped steel, also known as I-beam, has light weight, strong bending resistance, good rigidity and excellent mechanical properties. At present, the common production of H-shaped steel mainly has two methods: hot rolling forming and welding forming. Among them, thick-walled H-shaped steel is produced by hot rolling method, and thin-walled H-shaped steel is produced by induction welding method. When the thin-walled H-shaped steel is welded by induction, the alternating magnetic field generated by the induction coil generates an induced eddy current on the H-shaped steel. Under the action of the skin effect and the proximity effect, the eddy current is concentrated on the flange and the web to be welded, and the thermal effect of the passing current H...

AI Technical Summary

Problems solved by technology

If the welding temperature is too high, it is easy to overheat and form perforation at the weld; if the welding temperature is too low, it will cause defects such as cold welding and affect product quality.

In the welding production, due to the obstruction of the squeeze roller and the positioning roller, the H-beam weld seam is blocked by the wing plate, and the mist generated by the coolant and other factors, it is impossible to directly measure the welding temperature at the welding point, and it is even more difficult to measure the real-time welding temperature. Adjust parameters such as welding speed

[0003] At present, there are many devices and methods in the field of H-shaped steel and temperature measurement in China. For example, Chinese patent CN106269910A is an invention in the field of H-shaped steel forming control; Under good conditions, temperature measurement can only be performed at a single location; Chinese patent CN106766976A discloses a temperature measurement device for detecting the internal temperature of an industrial furnace, but it can only be used to measure the temperature at a single location and requires direct contact After consulting dozens of invention patents in the field of induction welding H-beam and temperature measurement, it is found that the existing devices and methods cannot solve the problem that the temperature at the welding point cannot be directly measured in real time in the production of H-beam welding, and the welding quality cannot be guaranteed.

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