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Carbon dioxide gas shielded welding method 90
What's the Carbon dioxide gas shielded welding
Carbon dioxide gas welding is one of the welding methods, with carbon dioxide gas as the protection gas, welding method. Simple operation in application, suitable for automatic welding and all-round welding. No wind during welding, suitable for indoor work.
The Carbon dioxide gas welding method. (Sometimes a mixture of CO2+Ar). Simple operation in application, suitable for automatic welding and all-round welding. Poor wind resistance during welding, suitable for indoor work. Because of its low cost and easy production of carbon dioxide gas, it is widely used in enterprises of all sizes.
Due to the special influence of the 0 thermal physical properties of carbon dioxide gas, when using conventional welding power supply, it is impossible to form a balanced axial free transition by melting the metal at the welding wire end, which usually requires the use of short circuit and droplet shrinkage necking explosion. Therefore, compared with MIG welding free transition, there is more splash. But if the use of high quality welding machine, the right choice of parameters, can get a very stable welding process, so that the spatter is reduced to a minimum degree
Due to the low cost of the protective gas used, the welding seam is well formed when using short circuit transition, and the use of wire containing deoxidizer can obtain high quality welding joint without internal defects. Therefore, this Carbon dioxide gas shielded welding method has become one of the most important welding methods for ferrous metal materials.
Carbon dioxide gas shielded welding method four step
Arc starting method:
direct strike method – electrode arc starting end and welding parts gently knock, lift arc, keep 2-4mm arc length. Easy to produce pores. Not easy to master. Not suitable for beginners. Generally used for acid electrode.
Skilled welders, the use of alkaline electrode when the weld is narrow can be used. Scratching method – like scratching matches, gently contact with welding parts, the action range is very small, after lighting the arc, keep the arc length of 2-4mm. Easy to scratch base metal, not suitable for use in low alloy high strength steel and other metals with large quenching tendency. Because it is easy to operate, it is suitable for beginners to use, generally used with alkaline electrode welding.
arc starting position:
Generally at the beginning of the welding end 15-20mm arc starting, from the end of the normal welding, this is based on the thermal ionization of gas away from the design, because the higher the temperature, the easier the thermal ionization, the easier the arc. It is called preheating arc ignition.
Pay attention to the bottom arc from both sides of the groove bypass type arc; Attention should be paid to the arc initiation of the filling layer on the welding path, and the arc initiation of the joint should prevent arc initiation in the molten pool or in the gap of the groove. There is a gap arc starting using repeated arc method. If the arc is drawn directly from the beginning end, it is easy to stick the arc and the weld pass are narrow and high. Depending on the welding method, such as left welding method and right welding method is different, arc starting on the right or left side of the weld.
To prevent sticking arc and sticking arc treatment:
To prevent sticking arc measures: appropriate welding current value, alkaline electrode thick plate welding using appropriate arc current (2-5) thrust current (2-5) sticking arc arc using left and right shaking to make the electrode from the welding piece, if not, you can loosen the clamp. Prevent the use of welding clamp long short circuit or irregular swing. 。
The similarities between the methods and characteristics of all kinds of conveyance and the application of all kinds of conveyance methods are as follows:
wrist conveyance is adopted with stable and uniform speed and distinct frequency rhythm. Static and static combination. Flexible.
