CN-117123899-B - Argon filling device for local welding in stainless steel pipeline

Abstract

The argon filling device for local welding in the stainless steel pipeline is characterized in that a plurality of air flow pipes are communicated with an annular air pipe in a welding mode and are connected in a welding mode, round rubber sealing plates are arranged at two ends of the device, the rubber sealing plates are clamped by two baffles made of thin steel plates, the baffles and the rubber sealing plates are connected and clamped and fixed through bolts, an air inlet guide pipe at the air inlet end penetrates through the two steel plates and the rubber sealing plates to be communicated with the annular air pipe and is welded and connected with the annular air pipe, the annular air pipe is welded and fixed on an inner baffle, and a handle is arranged on an outer baffle far away from one end of the air inlet guide pipe. The argon gas blocking device is suitable for pipelines with the diameter of less than 450mm, is convenient to install, is uniform and stable in argon gas supply, has a good blocking effect, ensures a good argon gas protection atmosphere, and is low in manufacturing cost and easy to take out after welding.

Inventors

• TANG BIHUA
• AI AIGUO
• ZHOU WU
• TAN CHANGXIN
• ZHANG BIN

Assignees

• 湖南华菱湘潭钢铁有限公司

Dates

Publication Date

20260512

Application Date

20230923

Claims (2)

1. 1. The argon filling device for local welding in the stainless steel pipeline is characterized in that a plurality of shunt pipes are communicated with an annular vent pipe in a welding mode and are connected in a welding mode, small shunt holes are densely distributed on the shunt pipes, two ends of each shunt pipe are provided with round rubber sealing plates which are clamped by two baffles made of thin steel plates, the baffles and the rubber sealing plates are connected and clamped and fixed through bolts, and an air inlet pipe at the air inlet end passes through the two connecting plates and the rubber sealing plates to be communicated with the annular vent pipe and connected in a welding mode, and the annular vent pipe is welded and fixed on the inner baffle.
2. 2. The argon filling device for local welding in a stainless steel pipeline according to claim 1, wherein a handle is arranged on an outer baffle plate at one end far away from the air inlet conduit.

Description

Argon filling device for local welding in stainless steel pipeline Technical Field The invention belongs to the technical field of welding, and relates to a local argon filling device for filling protective gas into a pipeline in the welding process of a stainless steel pipeline. Background Crude benzene is one of products in crude gas generated by pyrolysis of coal, and benzene compounds recovered from deaminated coke oven gas are mainly contained in benzene, and are called crude benzene. The crude benzene is light yellow transparent liquid, is lighter than water, is insoluble in water, is mainly used for deep processing to prepare products such as benzene, toluene, xylene and the like, and is precious basic organic chemical raw materials. Crude benzene has strong corrosiveness, is inflammable and explosive, and is extremely easy to burn and explode when meeting high heat or open fire. When corrosive media such as crude benzene are conveyed through a pipeline, the pipeline material is required to be stainless steel with corrosion resistance, and the best connection mode between the pipeline steels is welding. The welding technology is used as a mode capable of realizing intermetallic connection, can achieve the combination of metal atoms, and has good compactness, the performance is equivalent to and even better than that of a base metal, and a permanent joint of the base metal is further ensured, so that the pipeline steel corrosive medium can bear severe environment, can resist corrosion and is not leaked in the conveying process. The welding of stainless steel pipe line steel adopts butt joint, in order to ensure that the whole thickness of the steel pipe can be thoroughly welded, multilayer multi-pass welding is generally adopted, and the butt joint welding consists of priming, filling and capping. The backing weld is positioned at the root of the whole weld joint, is the surface contacted with the oil-gas medium, and is the most important part. The small and medium diameter pipeline steel has poor accessibility of backing welding due to the limitation of welding space, the quality of backing welding cannot be ensured by double-sided welding, and only a single-sided welding double-sided forming technology can be adopted for welding. The single-sided welding double-sided molding refers to welding only on one side of a welding piece, so that the welding seams which are uniform and tidy and good in forming and meet the quality requirements can be obtained on both sides of the front side and the back side of the welding piece, and the welding of the stainless steel pipe line steel at present mainly adopts a single-sided welding double-sided molding technology. The welding method of the stainless steel pipe line steel is an ideal backing welding method, the welding specification of the tungsten argon arc welding is small, the heat input is small, a molten pool is easy to control during backing welding, the problem of burning-through is not easy to occur, argon is inert gas, is not dissolved in the molten pool, does not react with the molten pool in any chemical way, can effectively protect a welding area from being polluted, and takes argon as a gas medium, the tungsten argon arc welding arc is stable once formed, a welder can conveniently observe the molten pool, the molten pool is controlled, and the quality of a welding joint is ensured. The welding of the stainless steel pipe line steel adopts argon tungsten-arc welding for backing welding, and the quality of the front welding seam can be effectively ensured. However, the welding seam on the back of the stainless steel pipeline steel is extremely easy to oxidize, alloy elements are burnt, welding defects such as oxide slag, air holes and the like are easy to generate in the welding process, and the mechanical property and the corrosion resistance of the welding seam metal are reduced. Effective protective measures must be taken to ensure the weld quality at the back of the weld. When the stainless steel pipe is conveyed by corrosive medium, the specification of the pipeline is 219mm multiplied by 8mm, and constructors cannot enter the pipeline due to space limitation, so that the back of the welding seam is protected from oxidization by filling inert gas such as argon into the pipeline. Medium and small diameter pipeline steel pipe inner filling the argon common method and the characteristics are as follows: (1) Sealing two ends of the pipeline by using adhesive tape, a rubber plate, a paper shell and the like, filling argon into one end of the pipeline, plugging the other end of the pipeline, and punching an exhaust hole with the diameter of 3-5 mm on the upper part of the plugging plate. In the welding process, in order to prevent the argon from being filled in and leaking out too quickly, a section of pipe orifice is sealed by an adhesive tape at the gap of the welding joint, only the length of one-time continuous welding or the total length of the w