Pipeline welding argon filling device

Abstract

The invention discloses a pipeline welding argon filling device. The pipeline welding argon filling device comprises a first pipeline and a connected second pipeline to be welded. One end of the first pipeline and one end of the second pipeline make contact, and the corresponding ends of the first pipeline and the second pipeline are provided with welding grooves. A first gas bag is arranged inside the first pipeline, and a second gas bag is arranged inside the second pipeline. An argon exhaust pipe is arranged on the first gas bag in a penetrating mode. An argon filling pipe is arranged on the second gas bag in a penetrating mode. A gas pipe is arranged between the first gas bag and the second gas bag and communicates with the first gas bag and the second gas bag. The outer side of the second gas bag is connected with a gas filling and exhaust pipe. By the adoption of the mode, the pipeline welding argon filling device guarantees welding quality of welded joints, an inner cavity needing to be filled with argon of each pipeline can be retracted through the first gas bag and the second gas bag, and therefore the consumption and cost of argon are reduced, and stability of argon filling protection in the welding process is improved.

Description

technical field [0001] The invention relates to the field of pipeline welding, in particular to an argon flushing device for pipeline welding. Background technique [0002] In the welding construction of large-diameter pipelines, direct aerobic welding makes the metal at the root of the weld easily oxidized, or even burned, and the welding quality is difficult to guarantee. In order to improve the welding quality, argon gas can be filled in the pipeline to cut off the contact between oxygen and the root of the weld, so that the metal at the root of the weld has no oxidation and burnout, which can improve the welding quality. [0003] In the past, the full filling method (that is, the inner cavity of the pipeline is filled with argon gas) is generally used for argon filling protection, but the quality of welding protection is unstable, and the effect of argon filling depends on the size of the inner cavity of the pipeline. When the pipeline is short and the inner cavity When...

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Problems solved by technology

[0003] In the past, the full filling method (that is, the inner cavity of the pipeline is filled with argon gas) is generally used for argon filling protection, but the quality of welding protection is unstable, and the effect of argon filling depends on the size of the inner cavity of the pipeline. When the pipeline is short and the inner cavity When the pipe is long and the inner cavity is large, the protective effect of argon filling is not obvious, and the amount of argon gas is large, the cost is high, and it is uneconomical

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