阅读说明：本技术 一种焊接气路保护系统及气体保护焊接方法 (Welding gas circuit protection system and gas protection welding method ) 是由 白宇慧 于 2019-12-11 设计创作，主要内容包括：本发明公开了一种焊接气路保护系统,包括控制气路和安全气路,控制气路和安全气路由三通阀连接。采用本发明焊接气路保护系统进行焊接方法包括气路排气、焊接和密封管路等步骤。本发明的有益效果是：本发明通过简单有效的控制气路和安全气路,确保气源在转换过程中进入气管内的空气可以有效排出；控制气路排除空气的所有操作必须在安全气路处在密闭条件下实现,即满足空气不进入安全气路；同时整个气路系统可以有效的避免焊接过程中杂质对焊缝的影响；本发明的气路保护系统及其控制方法能够很好的排除进气管路内部的空气,吸附保护气体的水分和杂质,整个过程操作简单,可以安全有效的提高焊接质量。(The invention discloses a welding gas circuit protection system which comprises a control gas circuit and a safety gas circuit, wherein the control gas circuit and the safety gas circuit are connected by a three-way valve. The welding method adopting the welding gas path protection system comprises the steps of gas path exhaust, welding, pipeline sealing and the like. The invention has the beneficial effects that: the invention ensures that the air entering the air pipe in the conversion process of the air source can be effectively discharged by simply and effectively controlling the air path and the safe air path; all operations of controlling the air path to exhaust air must be realized under the closed condition of the safety air path, namely, the air does not enter the safety air path; meanwhile, the whole gas circuit system can effectively avoid the influence of impurities on the welding seam in the welding process; the gas circuit protection system and the control method thereof can well remove the air in the gas inlet pipeline and adsorb the moisture and impurities of the protective gas, the whole process is simple to operate, and the welding quality can be safely and effectively improved.)

1. The welding gas circuit protection system comprises a control gas circuit and a safety gas circuit, and is characterized in that the control gas circuit and the safety gas circuit are connected through a three-way valve.

2. The welding gas circuit protection system according to claim 1, wherein three ports of the three-way valve are respectively an exhaust port, an inlet port and an outlet port, the control gas circuit is composed of a gas cylinder, a pressure regulating valve connected to the gas outlet of the gas cylinder and a flow meter connected to the pressure regulating valve, and the flow meter is connected to the inlet port through a hose; the safety gas circuit is formed by sequentially connecting a molecular sieve, a filter and a through one-way valve, wherein a gas inlet of the molecular sieve is connected with a gas outlet port, and a gas outlet of the through one-way valve is connected with a welding handle through a hose.

3. The welding gas path protection system according to claim 2, wherein the safety gas paths are connected in parallel with the flow meter through the three-way valve, and the gas outlets of the direct one-way valves of the other safety gas paths are connected with an internal blowing pipe through a hose.

4. A gas-shielded welding method using the welding gas circuit protection system according to any one of claims 1 to 3, comprising the steps of:

1) air path exhaust: closing the straight-through one-way valve, rotating the three-way valve to communicate the air inlet port with the air outlet port, opening the pressure regulating valve, discharging air in the air path, closing the pressure regulating valve and closing the air outlet port;

2) welding: opening a pressure regulating valve, rotating a three-way valve to communicate an air inlet port with an air outlet port, opening a straight-through one-way valve to perform welding outside the pipe, or simultaneously opening two safety air paths, and placing an inner blowing pipe at a welding position inside the pipe to be welded to realize simultaneous inside and outside protective welding;

3) sealing the pipeline: after welding is finished, the straight-through one-way valve is closed firstly, then the pressure regulating valve is closed, and the three-way valve maintains the state during welding.

5. The gas-shielded welding process according to claim 4, wherein in steps 1) and 2), the pressure regulating valve is pressure-regulated to 0.4-0.7 MPa.

Technical Field

The invention relates to the field of welding, in particular to a welding gas circuit protection system and a gas protection welding method.

Background

The welding method adopted for welding different sizes and materials is different, and for the welding method needing gas protection, such as TIG welding, the purity of a gas source is required to meet the requirement, and the influence of air on a welding seam in the welding process is also avoided. The automatic welding machine under gas protection can realize welding automation and has good welding quality, but the color and the welding quality of a welding seam are easily changed greatly under the condition of welding gas source conversion and the air entering in the welding process. In the fields of semiconductors, electronics, food, medical treatment and the like with high requirements on cleanliness of welding parts, especially for pipe welding, the requirement on attractive forming and no oxidation phenomenon exist, a gas circuit protection system of a gas exchange source of an automatic welding machine for gas protection is imperfect, and in the process of converting a welding gas source, air or impurities are easily mixed in a gas pipe, so that the whole gas circuit system is influenced, and the welding quality is reduced.

Disclosure of Invention

The invention provides a welding gas circuit protection system and a gas protection welding method aiming at the defects of gas protection in the existing welding process.

The technical scheme for solving the technical problems is as follows: the welding gas circuit protection system comprises a control gas circuit and a safety gas circuit, wherein the control gas circuit is connected with the safety gas circuit through a three-way valve.

Furthermore, three ports of the three-way valve are respectively an exhaust port, an air inlet port and an air outlet port, the control gas path consists of a gas cylinder, a pressure regulating valve connected to the gas outlet of the gas cylinder and a flow meter connected with the pressure regulating valve, and the flow meter is connected with the air inlet port through a hose; the safety gas circuit is formed by sequentially connecting a molecular sieve, a filter and a through one-way valve, wherein a gas inlet of the molecular sieve is connected with a gas outlet port, and a gas outlet of the through one-way valve is connected with a welding handle through a hose.

Furthermore, the safety gas paths are connected with the flowmeter in parallel through the three-way valve, and the air outlets of the direct one-way valves of the other safety gas path are connected with the internal blowing pipe through hoses. Two sets of safety gas circuits are adopted, so that the front side and the back side of the welding can be protected simultaneously.

The invention also discloses a gas shielded welding method by adopting the welding gas circuit protection system, which comprises the following steps:

1) air path exhaust: closing the straight-through one-way valve, rotating the three-way valve to communicate the air inlet port with the air outlet port, opening the pressure regulating valve, discharging air in the air path, closing the pressure regulating valve and closing the air outlet port;

2) welding: opening a pressure regulating valve, rotating a three-way valve to communicate an air inlet port with an air outlet port, opening a straight-through one-way valve to perform welding outside the pipe, or simultaneously opening two safety air paths, and placing an inner blowing pipe at a welding position inside the pipe to be welded to realize simultaneous inside and outside protective welding;

3) sealing the pipeline: after welding is finished, the straight-through one-way valve is closed firstly, then the pressure regulating valve is closed, and the three-way valve maintains the state during welding.

Wherein, in the steps 1) and 2), the pressure of the pressure regulating valve is regulated to 0.4-0.7 MPa.

The invention has the beneficial effects that: the invention ensures that the air entering the air pipe in the conversion process of the air source can be effectively discharged by simply and effectively controlling the air path and the safe air path; all operations of controlling the air path to exhaust air must be realized under the closed condition of the safety air path, namely, the air does not enter the safety air path; meanwhile, the whole gas circuit system can effectively avoid the influence of impurities on the welding seam in the welding process; the gas circuit protection system and the control method thereof can well remove the air in the gas inlet pipeline and adsorb the moisture and impurities of the protective gas, the whole process is simple to operate, and the welding quality can be safely and effectively improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of example 2;

FIG. 3 is a substance element analysis chart of the weld surface after the steel pipe is welded in example 1;

FIG. 4 is a diagram of the analysis of the material elements on the surface of the welded seam after the steel pipe is welded by the existing gas shielded welding method;

in fig. 1 and 2, the parts are respectively:

1. the gas cylinder comprises a gas cylinder body, 2, a pressure regulating valve, 3, a flow meter, 4, a three-way valve, 4-1, an exhaust port, 4-2, an air inlet port, 4-3, an air outlet port, 5, a molecular sieve, 6, a filter, 7, a direct one-way valve, 8, a welding handle, 9 and an internal blowing pipe.

Detailed Description

The present invention is described below with reference to examples, which are provided for illustration only and are not intended to limit the scope of the present invention.