What is the difference between argon arc welding, stainless steel welding and aluminum welding? What are the key points of operation?

The argon arc welding machine for welding aluminum must have electromagnetic vibration to destroy the oxide layer of aluminum profile, and the melting point of the oxide layer is close to 1000 degrees;

General argon arc welding machine can be used to weld stainless steel. Pay attention to the adjustment of current attenuation switch during operation, otherwise a large area of burn-through will occur at the end of welding. Secondly, master the current, welding speed and wire feeding speed.

2, the scope is different:

Aluminum welding is heterogeneous welding of aluminum pipe socket, central air conditioning copper pipe and galvanized pipe, stainless steel pipe and aluminum pipe in refrigeration industry. Welding of aluminum terminals, aluminum leads and aluminum conductive rods in substation industry. Welding of radiator tube, motor and bus in electronic and electrical industry.

Stainless steel welding is suitable for stainless steel covered electrode for manual arc welding. The chromium content in this covered electrode deposited metal should be greater than 10.50%, and the iron content should exceed any other element.

Key points: Aluminum welding includes manual arc welding and submerged arc welding. The arc combustion between the electrode and the workpiece is used as the heat source. Different filler metals can be used. Argon arc welding: using the electric arc between the tungsten electrode and the workpiece to melt the metal and form a weld. When welding, the tungsten electrode does not melt, but only acts as an electrode.

Extended data:

1, argon arc welding argon arc welding is an arc welding with argon as protective gas. In argon arc welding, argon is sprayed from the nozzle to form a closed and continuous gas protective layer, which isolates the arc and molten pool from the atmosphere, avoids the invasion of harmful gases and plays a protective role. According to the different covered electrode used, argon arc welding can be divided into melting electrode argon arc welding and non-melting electrode (or tungsten electrode) argon arc welding.

Argon arc welding is mainly used for welding non-ferrous metals (such as aluminum, magnesium, copper, titanium and alloys) and rare metals, as well as high-strength alloy steel, stainless steel and heat-resistant steel.

Single-sided welding of stainless steel lining ring: the welder starts arc welding at the outer groove, and the stainless steel lining ring with high melting temperature forces the penetrated weld meat to be completely formed to ensure the formation of the internal surface of the weld. For the welding seam with lining ring on one side, avoid melting the stainless steel lining ring due to too high arc temperature, and avoid polishing the stainless steel lining ring during grinding, resulting in pollution of stainless steel materials.

2. Non-melting pole:

Working principle and characteristics: Non-melting electrode argon arc welding is that the arc burns between the non-melting electrode (generally tungsten electrode) and the workpiece, and inert gas (generally argon gas) which does not react with the metal flows around the welding arc to form a protective gas cover, so that the tungsten electrode, the arc, the molten pool and the high-temperature metal near the heat affected zone do not contact with air, which can prevent oxidation and absorb harmful gases.

3, melting pole:

Working principle and characteristics: the welding wire is fed through the wire wheel, and the conductive nozzle conducts electricity, so that an arc is generated between the base metal and the welding wire, and the welding wire and the base metal are melted. The inert gas argon is used to protect the arc and melt the metal for welding. Different from TIG welding: one is that the welding wire is used as the electrode, which is continuously melted and filled into the molten pool, and then condensed to form a weld;

The other is to use protective gas. With the application of MIG welding technology, shielding gas has developed from a single argon gas to a variety of mixed gases. For example, when argon or helium is used as shielding gas, it is called MIG welding (MIG welding for short internationally).

References:

Baidu encyclopedia-argon arc welding

References:

Baidu encyclopedia-aluminium welding

References:

Baidu encyclopedia-stainless steel welding