Research On The Activated CO₂-gas Shielding Arc Welding

As a high efficiency, saving energy and low consumption method, co2-gas shielding arc welding has been used in the welding field broadly, especially the welding of thin welding wire under the small regulation. In the condition of small regulation, the main material transfer is short circuit transfer with many spatters, overlarge reinforcement and narrow welding seam due to the character of co2 gas. Focusing on the mentioned drawbacks, the exploitation of low spatters, good welding seam confectioning process is a topic subject.The dissertation shows an activated co2-gas shielding arc welding process optimizing welding spatters and seam confectioning based on metallurgic principle. A activated co2-gas shielding arc welding experiment system is built and arc behavior, material transfer, welding spatters, welding beam are studied. It supplies a fundament for project application.Below are the contents, highlights and results of the dissertation.1, Activated fluxes are taken into the space of welding arc homogeneously and stably by Building an activated co2-gas shielding arc welding experiment system by transformation of normal co2-gas shielding arc welding apparatus and prilling method. Therefore the activated welding is realized.2, In the experiments, we record the wave profile of voltage and electricity and the pictures of material transfer process. The results show that welding arc expands the top of droplets in the action of activated flux by DCSP, and then the droplets are refined and transfer frequency is increased. In the same time, the ratio of instant short-circuit transfer reduces.3, The contrast experiments show that welding spatters reduce obviously and welding seam confectioning gets modification which is low reinforcement and increase of insufficient penetration and width in the small and medium regulations. The main reason is the change of arc behavior, the type of material transfer and flow pattern of welding pool.