Laser welding automatic following protective gas jetting blowing system

Abstract

The invention discloses a laser welding automatic following protective gas jetting blowing system. The laser welding automatic following protective gas jetting blowing system comprises a jetting blowing device provided with a jetting rod, the jetting rod is connected with a jetting head, a jetting blowing passage of the jetting rod is provided with a laser positioning component, after protective gas analog signals sent by the laser positioning component are sent out from a jetting mouth, an actual position of protective gas jetting blowing is labeled out in a form of laser projection, the system further comprises a position detection device, a coordination control device and a flow quantity and pressure detection control device, the welding line middle position which finally needs to be jetted and blown is taken as a target position, the position detection device is used for detecting the distance or overlap degree of the actual position and the target position, the coordination control device is used for maintaining overlap or automatic following of the two positions, a flow quantity and pressure detection control component is used for detecting the unimpeded situation of the protective gas jetting blowing passage and performing flow quantity adjustment according to the detected result, a jetting hole of the jetting head is of a round hole shape, the hole wall of the jetting hole is provided with grooves which are evenly arranged along the periphery wall, and the groove bottom of each groove is square.

Description

technical field [0001] The invention relates to protective gas injection during laser welding of equipment such as laser welding machines, and is particularly suitable for a carbon dioxide laser welding protective gas injection system for laser welding machines of high-speed continuous rolling mills in iron and steel enterprises. Background technique [0002] Two cold-rolled acid-rolled laser welding machines, mainly used for welding hot-rolled steel strips with a thickness of 2mm-3mm and a hardness of HR30Te between 42-65. The output mirror of the laser source body of the welding machine has an output spot diameter of 22mm and a laser beam with a power of 8KW. , the laser has relatively good deep penetration, but when welding molten steel, a large amount of plasma cloud will be generated, which will cause it to be unable to effectively melt the subsequent strip steel and produce pores and virtual welds, so it is necessary to use protective gas to blow off the plasma cloud. ...

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Problems solved by technology

[0002] Two cold-rolled acid-rolled laser welding machines, mainly used for welding hot-rolled steel strips with a thickness of 2mm-3mm and a hardness of HR30Te between 42-65. The output mirror of the laser source body of the welding machine has an output spot diameter of 22mm and a laser beam with a power of 8KW. , the laser has relatively good deep penetration, but when welding molten steel, a large amount of plasma cloud will be generated, which will cause it to be unable to effectively melt the subsequent strip steel and produce pores and virtual welds, so it is necessary to use protective gas to blow off the plasma cloud. The equipment for blowing off the laser welding plasma cloud is the protective gas blowing device. The blowing device is installed on the base of the guide wheel of the welding machine. The fixing hole of the base is waist-shaped and fixed by bolts. Before the bolt is fixed, it can be roughly adjusted according to the approximate position of the laser. Since the spraying direction of the nozzle protective gas and the laser focus position are not visible during adjustment, the accuracy of the adjustment is relatively low, and welding porosity is likely to occur during welding, which affects the welding quality. However, the position of the nozzle must be adjusted after the pores are generated. Due to the poor adjustment accuracy and low efficiency of the existing equipment, this problem seriously affects the welding quality of the welding machine and the normal production of the unit.

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