Bypass hot wire plasma arc welding device and welding method

Abstract

The invention provides a bypass wire heating plasma arc welding device and a welding method. The welding device comprises a plasma welding power source, a bypass wire heating plasma welding gun, a high-frequency arc igniter, a current sensor, a bypass current division control module and a control system. When keyhole plasma arc welding is conducted, the quite high welding wire fusion efficiency is obtained by the adoption of a more efficient wire feeding mode and a bypass electric arc wire heating technique, a gap generated by plasma arcs can be filled efficiently, the thermal input of base metal is controlled accurately through bypass current division so that an ideal molten drop transition mode and weld joint formation can be obtained, and welding defects are reduced. By means of the bypass wire heating plasma arc welding device and the welding method, the advantages that the thermal input of bypass current division is low, the penetrability of plasma is high, and the fusion efficiency of bypass electric arc wire heating is high are well combined, filler wires can be heated efficiently and stably, effective weld penetration of welding workpieces can be guaranteed, and under the condition that the low-thermal-input welding of the workpieces can be guaranteed, double-face formation of thick-wall metal can be achieved at the same time through one-time single-face welding.

Description

technical field [0001] The invention relates to a welding device, in particular to a bypass hot wire plasma arc welding device and a welding method. Background technique [0002] The development and promotion of welding technology with high efficiency, high reliability and low energy consumption is the need for sustainable development of the manufacturing industry, and it is also the development direction of advanced welding technology. Traditional arc welding processes (SMAW, TIG welding, MIGA welding, etc.) are still the most commonly used process for manufacturing large metal structures, such as ship hulls and pressure vessels, due to their low cost, simple operation, and strong adaptability means. However, due to the limited penetration ability of the arc, for the connection of medium and thick-walled metal structural parts, the base metal often needs to be beveled on one or both sides for multi-layer multi-layer welding, which brings about cost increase and production ...

AI Technical Summary

Problems solved by technology

Although this method can also effectively control the heat input to the base metal, the method uses double-sided welding to increase the penetration depth and improve the deposition efficiency, resulting in relatively high requirements for the assembly and fixing of the workpiece and the welding position. High, and the installation and adjustment of the welding device is relatively complicated. At the same time, due to the limited penetration capability of TIG and MIG arcs, the thickness of the steel plate that can be welded is also limited. When the plate thickness is large, it is difficult to use the above method to obtain ideal results.

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