Integrated lockhole effect TIG deep penetration welding gun

Abstract

The embodiment of the invention discloses an integrated lockhole effect TIG deep penetration welding gun. The integrated lockhole effect TIG deep penetration welding gun comprises a welding gun body, a tungsten electrode, a tungsten electrode clip and a clip lock nut. The welding gun body is provided with a venthole, a water inlet hole and a water outlet hole, and the water inlet hole and the water outlet hole are connected on the lower portion of the welding gun body and form an annular cooling water tank. A plurality of air outlet channels communicating with the venthole in the radial direction are formed in the positions, at the side end of the lower portion of the annular cooling water tank, of the welding gun body. The tungsten electrode is indirectly installed inside the lower end of the venthole in a surface contact mode through the tungsten electrode clip and matched with the clip lock nut so that the tungsten electrode clip can be fixedly installed at the lower end of the welding gun body. The clip lock nut and the air outlet channels are arranged on the lower portion of the welding gun body through a gas hood nozzle in a covering mode. By adopting the integrated lockhole effect TIG deep penetration welding gun, when 1000 A high-current welding is conducted, the welding gun body can be subjected to effective cooling protection, meanwhile, the tungsten electrode can be protected through protective gas, and lockhole deep penetration welding with a large depth of penetration can be achieved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an integrated keyhole effect TIG deep penetration welding torch. Background technique [0002] TIG welding (Tungsten Inert Gas arc Welding), also known as inert gas tungsten shielded welding, is currently used in metal The welding field is widely used. According to the shape of the TIG welding arc, it can be divided into three welding methods: ordinary TIG welding, plasma arc welding and keyhole effect deep penetration arc welding. [0003] Ordinary TIG welding equipment is simple and low in cost, very suitable for manual welding, but its arc is a free arc, in the form of a diffuse cone at a 45° angle, and the arc force is distributed exponentially on both sides in the radial direction, with low energy density and shallow welding penetration (generally <4mm), the metal deposition rate and welding efficiency are very low, and it requires high hand-eye coordination skills of t...

AI Technical Summary

Problems solved by technology

[0009] 2. The angle of the tip of the tungsten electrode decreases or the diameter of the tungsten electrode increases, and the arc pressure increases

[0010] 3. The reduction of the cone angle at the top of the tungsten pole reduces the radius of the conductive cross-section at the top of the tungsten pole, which will lead to an increase in the current density and an increase in the electromagnetic contraction force, and the cone angle at the top of the tungsten pole can reduce the resistance of the supplementary airflow. It helps to increase the peak pressure of the arc anode, but the smaller the cone angle at the tip of the tungsten electrode, the more serious the phenomenon of arc climbing at the tip of the tungsten electrode will increase the conductive area of ​​the tungsten electrode and the average current density will tend to decrease

[0011] Through further research, it is found that the temperature rise of the tungsten electrode is the main cause of the arc climbing phenomenon at the tip of the tungsten electrode. According to the tip discharge effect, the arc is initially generated at the tip of the tungsten electrode. At this time, the radius of the conductive interface is small and the current density is very high. Large, and the thermal effect generated by the large current density will cause the temperature of the tip of the tungsten electrode to rise sharply, and at the same time, the heat generated at the tip of the tungsten electrode will conduct upwards along the tungsten electrode, thereby driving the temperature of the rest of the tungsten electrode to rise, and the temperature of the tungsten electrode will increase. Enhancing the energy of the free electrons of tungsten metal, and then enhancing the ability of the tungsten electrode to emit electrons outward, so the phenomenon of creeping up and diffusing the arc at the tip of the tungsten electrode occurs

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