Double laser-double-wire bypass electric arc compound welding method

Abstract

The invention discloses a double laser-double-wire bypass electric arc compound welding method. The double laser-double-wire bypass electric arc compound welding method includes that continuous laser beams act on parent metal, and pulse laser acts at a necking position of a welding wire molten drop solid-liquid interface at the upper end of a double-wire welding gun; a welding wire is heated by electric arcs to form molten drops, and the sizes of the molten drops increase gradually while a pulse laser beam emits a specific frequency of laser on the welding wire molten drops at the upper end to exert a specific frequency of laser evaporation recoil force on the molten drops; the laser evaporation recoil force 'cuts' the molten drops, and change of the pulse frequency makes the sizes, transition frequency, flying direction and track of the molten drops change to promote the molten drops to complete transition; the molten drops are isolated from the welding wire under bombardment of the laser evaporation recoil fore and are promoted to enter a molten pool by means of transition, so that deposition efficiency is improved; a computer control system achieves closed-loop control of fixed arc length by detecting change of electric arc voltage. The double laser-double-wire bypass electric arc compound welding method is capable of achieving high-efficiency high-quality great-fusion-depth low-spattering welding with narrow heat-affected zones at a high welding speed.

Description

technical field [0001] The invention belongs to the technical field of welding and relates to a dual laser-double wire bypass arc composite welding method. Background technique [0002] Gas Metal Arc Welding (GMAW) is currently the most commonly used welding method in industrial production. With the advent of Industry 4.0, modern welding technology is developing towards high efficiency, high quality and low consumption. The control of production rates and heat input places higher and higher demands. Improving the welding speed and deposition speed is the main way to achieve high-efficiency welding. In the traditional welding process, the increase of welding current will inevitably lead to the increase of heat input, resulting in the decline of welding quality. Improving welding quality and production efficiency, reducing heat input and welding defects are necessary means to achieve high-efficiency and high-quality welding. [0003] With the development of welding technolog...

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Problems solved by technology

However, the disadvantages of low energy conversion rate, poor weldability of high reflectivity materials, high requirements for workpiece assembly, and high cost restrict its development.

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