A compact large penetration plasma arc welding torch

Abstract

The invention relates to a compact large penetration plasma arc welding torch, which belongs to the technical field of plasma arc welding. The ion gas passes through the gas guide porcelain sleeve and the water-cooled copper nozzle, and the shielding gas passes between the water-cooled copper nozzle, the gas shield, and the gas shield head; an insulating sleeve is provided on the outside of the tungsten electrode, and a nozzle is provided on the outside of the insulating sleeve A water-cooled copper nozzle is arranged at the end of the nozzle seat, a gas shield is arranged outside the nozzle seat, and a gas shield head is arranged at one end of the gas shield. The water-cooled copper nozzle is a circular platform, and the inclination angle of the air guide porcelain sleeve is the same as that of the water-cooled copper nozzle. The top is thick and the bottom is thin, evenly inclined, and there is no sudden change in the structure, which can not only ensure the smooth passage of the airflow, but also make the airflow gradually compress during the process of flowing along the inner wall of the nozzle, and maintain a greater speed when the ionized gas exits the gun, so as to have a stronger penetration.

Description

technical field [0001] The invention relates to a compact plasma arc welding torch with large penetration depth, which belongs to the technical field of plasma arc welding. Background technique [0002] The development of welding technology with high efficiency, low energy consumption and high reliability is the development direction of advanced welding technology and the need of sustainable development of modern manufacturing industry. Due to the limitation of the penetration ability of the welding arc in the traditional arc welding process, for the connection of medium and thick-walled metal structural parts, the base metal often needs to be grooved on one or both sides for multi-pass multi-layer welding, which brings increased costs. , reduced production efficiency, expanded heat-affected zone, and welding defects. [0003] Plasma arc welding is an arc welding process with high energy density. It uses plasma arc as a heat source. After the welding arc undergoes thermal c...

AI Technical Summary

Problems solved by technology

However, when the thickness of the base metal is larger, the penetration ability of the arc is limited, and the stability of the piercing process is insufficient or the penetration cannot be achieved, which limits the application of plasma arc welding in the welding of large and thick plates.

[0004] In the welding process, in order to improve the welding quality and adjust the process parameters, it is necessary to monitor the state of the molten pool and the behavior of the arc. The cover usually includes a complex structure such as a water cooling system, which increases the diameter of the torch head, and in order to ensure the penetration and arc stiffness of the conventional welding torch, the height of the plasma arc welding is relatively small, generally controlled within 10mm, resulting in a poor view of the welding area. Narrow, which seriously affects the monitoring of the state of the molten pool and the arc behavior during the welding process

[0005] Conventional water-cooled gas hoods are directly in contact with ultra-high temperature arcs. Even if water cooling is used, it will still burn out in long-term use, and even destroy the water-cooled structure of the gas hood, resulting in unpredictable dangerous situations

[0006] To sum up, the existing plasma arc torches cannot meet the requirements of process improvement and quality improvement

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