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Type of welding gas

Views: 15     Author: Site Editor     Publish Time: 2019-08-05      Origin: Site

Welding Gases, a gas industry term, has been rapidly developed due to its advantages of good welding quality, high efficiency, and easy automation. The welding shielding gas can be a unit gas or a binary or ternary mixture. The purpose of using welding protective gas is to improve the quality of the weld, reduce the width of the weld heating band, and avoid oxidation of the material. The unit gas has argon, carbon dioxide, a binary mixture of argon and oxygen, argon and carbon dioxide, argon and helium, a mixture of argon and hydrogen. The ternary mixture has a mixture of helium, argon and carbon dioxide. Different welding ratios of different proportions are selected for the application of the medium welding consumables.

1. What is CO2 welding?

Carbon dioxide protection welding is called carbon dioxide gas shielded arc welding. MIG welding with a purity of > 99.98% of CO2 as a shielding gas - called CO2 welding.

2. What is MAG welding?

MAG (Metal Active Gas Arc Welding) is the abbreviation for the melting of active gas shielded arc welding.

It is a mixed gas shielded welding in which a small amount of oxidizing gas (oxygen, carbon dioxide or a mixed gas thereof) is mixed in argon. A gas metal arc welding using a mixed gas of 75--95% Ar + 25--5 % CO2 (standard ratio: 80% Ar + 20% CO2) as a shielding gas - called MAG welding.

3. What is MIG welding?

MIG welding (melting inert gas shielded welding)  method using molten electrode, adding gas as arc medium, and protecting metal droplets, welding pool and high temperature metal in welding zone, called melting Extreme gas shielded arc welding.

<1> Using a high-purity argon Ar ≥ 99.99% as a shielding gas for the protective gas to protect aluminum and aluminum alloys, copper and copper alloys and other non-ferrous metals;

<2> A process for the welding of solid stainless steel wire by a gas-shielded gas shielded with 98% Ar + 2% O2 or 95% Ar + 5% CO2 as a shielding gas - called MIG welding.

<3> MIG welding with 氦 + argon inert gas mixture for protection.

4. What is TIG (Tungsten Arc Welding) welding?

Tungsten Inert Gas Welding, also known as non-melting inert gas shielded arc welding, tungsten inert gas shielded welding. The shielding gas may be a mixed gas of argon, helium or argon. In special applications, a small amount of hydrogen can be added. Tungsten argon arc welding using argon as a shielding gas (inert gas-shielded arc welding using pure tungsten or activated tungsten (tungsten tungsten, tantalum tungsten, zirconium tungsten, tantalum tungsten) as an infusible electrode) Tungsten arc arc welding.

5. What is SMAW (electrode arc welding) welding?

An arc welding method in which a welding rod is manually manipulated for welding.

6. What is carbon arc gouging?

A method of surface processing using a carbon rod as an electrode to generate an arc between the workpiece and blowing the molten metal with compressed air (pressure 0.5-0.7 MPa). Commonly used for weld root removal, planing groove, repair defects, etc.

7. Why is CO2 welding more efficient than electrode arc welding?

<1> CO2 welding is 1-3 times higher than the welding arc welding speed and melting coefficient;

<2> The section of the groove is reduced by 50% compared with the electrode, and the amount of deposited metal is reduced by 1/2;

<3> The auxiliary time is 50% of the electrode arc welding.

The total of three items: the efficiency of CO2 welding is increased by 2.02--3.88 times compared with electrode arc welding.

8. Why is the quality of the welded joint of the CO2 welded joint better than the electrode arc welding?

CO2 weld has small heat affected zone and small welding deformation; CO2 weld has low hydrogen content (≤1.6ML/100g), small porosity and crack tendency; CO2 weld is well formed, surface and internal defects are less, and the qualified rate of flaw detection is higher than Welding rod arc welding.

9. Why is the overall cost of CO2 welding lower than electrode arc welding?

<1> The cross-sectional area of the groove is reduced by 36-54%, saving the amount of filler metal;

<2> Reduce power consumption by 65.4%;

<3> Equipment station fee is reduced by 67-80% compared with electrode arc welding, and the cost is reduced by 20-40%;

<4> Reduce labor costs, working hours, and reduce costs by 10-16%;

<5> Saving auxiliary working hours, auxiliary material consumption and correcting deformation costs;

According to the comprehensive five items, CO2 welding can reduce the total welding cost by 39.6-78.7%, with an average reduction of 59%.

10. What is a low frequency pulse? Which welding is suitable?

A pulsed arc with a pulse frequency of 0.5-30 Hz is called low frequency pulse welding. Mainly used for TIG welding of non-ferrous metals such as stainless steel, steel and titanium.


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