1、Overview
Carbon dioxide gas shielded welding (referred to as "CO2 shielded welding"(GMAW Welding Process)) is a method of welding with CO2 gas as the shielding gas (sometimes using a mixed gas of CO2 + Ar is called "mixed gas shielded welding"(FCAW Welding Process)). In terms of application, it is easy to operate, suitable for automatic welding and omnidirectional welding, and has high welding efficiency. It is widely used in workshop operations and on-site installation operations.
The price of CO2 gas is low, the welding seam is well formed when short-circuit transition is used, and high-quality welded joints without internal defects can be obtained by using welding wire containing deoxidizer. Therefore, this welding method (GMAW Welding Process ) has become one of the most important welding methods for ferrous materials, which is widely used in major small and medium-sized enterprises.
2、Development Process
As early as the 1930s, it was proposed to use CO2 and water vapor as protective gases, but the test results found that the weld metal was severely oxidized, with many pores, and the welding quality could not be guaranteed. Therefore, inert gas shielded welding such as argon and helium was first used in welding production, which solved the welding problem of non-ferrous metals in the aviation industry at that time, and the advantages of gas shielded welding were gradually recognized and valued by people. However, argon and helium are rare gases, which are expensive and limited in application. So, by the 1950s. People have re-studied CO2 gas shielded welding, and gradually applied to welding production.
3、 Categories
According to the operation method, CO2 gas shielded welding can be divided into two types: automatic welding and semi-automatic welding. For long straight welds and regular curved welds, automatic welding can be used; for irregular or short welds, semi-automatic or manual welding is used.
Compared with semi-automatic welding and manual welding, automatic welding equipment has many advantages. Taking Tianjin Yixin pipeline all-position automatic welding equipment as an example, the equipment has the following advantages: fast welding speed, beautiful welding seam shape and high consistency, stable welding seam quality and can meet various requirements such as UT/RT/MT flaw detection requirements, the equipment is light and portable, easy to operate, can be operated by basic welders, and can be used for welding in various positions such as flat plates, tanks, pipelines, etc., even in the 5G all-position process, it can realize automatic intelligent welding and so on.
This type of automatic welding equipment (also known as all-position pipeline welding machine; pipeline automatic welding equipment; welding head; intelligent welding machine; pipeline welding machine; orbital welding machine; automatic welding machine; automatic pipeline welding equipment, all-position pipeline welding equipment, etc. ) is widely used in petrochemical, natural gas (equivalent long-distance pipeline), thermal pipeline network, municipal engineering, water supply and drainage engineering, ship engineering, hydropower station and other types of projects, with a wide range of applications and high customer recognition. In field application, it is not only convenient to operate, but also can effectively shorten the construction time. It is considered to be an excellent choice for pipeline construction.
Post time: Sep-07-2022