What materials are suitable for TIG welding?

TIG welding can weld stainless steel, iron and metal metals.

According to the different electrodes, TIG welding can be divided into two types: MIG welding and non-MIG welding.

Non-melting electrode. Working principle and characteristics: non-melting electrode argon arc welding is the arc between the non-melting electrode (usually tungsten electrode) and the workpiece burning, around the welding arc flows through an inert gas that does not react with the metal (argon gas is commonly used), forming a protective gas hood, so that the tungsten terminal, the arc and the molten pool and the high-temperature metal adjacent to the heat-affected zone are not in contact with the air, which can prevent oxidation and absorb harmful gases.

The result is a dense welded joint with very good mechanical properties.

Melting electrode. Working principle and characteristics: The welding wire is fed through the wire wheel, and the contact tip conducts electricity, generating an arc between the base metal and the welding wire, melting the welding wire and the base metal, and using inert gas argon to protect the arc and molten metal for welding.

The difference between it and tungsten argon arc welding: one is that the welding wire is used as an electrode, and is continuously melted and filled into the molten pool, and the weld is formed after condensation; The other is the use of shielding gas, with the application of MIG-welding technology, shielding gas has developed from a single argon gas to a variety of mixed gas wide applications, such as argon or helium as the shielding gas is called MIG arc welding (referred to as MIG welding in the world); When the mixture of inert gas and oxidizing gas (O2, CO2) is used as the shielding gas, or when the CO2 gas or CO2+O2 mixture is used as the shielding gas, it is collectively referred to as MIG arc welding (referred to as MAG welding in the world). From the perspective of its operation mode, the most widely used at present is semi-automatic melting pole argon arc welding and argon-rich mixed gas shielded welding, followed by automatic melting pole argon arc welding.

TIG welding can weld almost all metal materials, especially suitable for welding chemically active metals and their alloys. It is usually used for welding aluminum, magnesium, titanium, copper and its alloys, low-alloy steel, stainless steel, heat-resistant steel, etc. It is suitable for welding non-ferrous metals and alloy steels that are prone to oxidation.

It is suitable for welding stainless steel, aluminum and other hardware materials.

TIG welding is also known as argon gas shielded welding. It is to pass argon arc protective gas around the arc welding to isolate the air from the welding area and prevent oxidation of the welding area.

2) Preparation before welding Before welding, the nozzle should be beveled at 30°, and the metal color should be polished within 15mm inside and outside the pipe end. The pipe to the mouth clearance is 1 3mm. When the actual counterpart gap is too large, the transition layer needs to be surfacing on the bevel side of the pipeline.

Set up temporary shelter facilities to strictly control the wind speed at the welding operation, because the wind speed exceeds a certain range, it is easy to produce pores. (3) Operation Use WST315 manual tungsten argon arc welding machine, the welding machine itself is equipped with a high-frequency arc striking device, and high-frequency arc striking can be used. Arc extinguishing is different from electrode arc welding, if the arc is extinguished too quickly, it is easy to produce arc pit cracks, so the weld pool should be led to the edge or thicker part of the base metal during operation, and then gradually shrink the molten pool and slowly extinguish the arc, and finally close the shielding gas.

Welding wires for TIG welding can be made of the following materials:

1. Pure aluminum welding wire.

Performance characteristics: pure aluminum welding wire, aluminum content greater than 99.5%, excellent corrosion resistance, high thermal and electrical conductivity, with excellent machinability.

2. Aluminum-silicon alloy welding wire.

Performance characteristics: It is an alloy welding wire containing 12% silicon, suitable for welding various casting and extrusion aluminum alloys, with low melting point and good fluidity so that the base metal welding deformation is very small.

3. Aluminum-silicon alloy welding wire.

Performance characteristics: It is an alloy welding wire containing 5% silicon, which is suitable for welding cast aluminum alloy.

4. Aluminum-magnesium alloy welding wire.

Performance characteristics: This product is an alloy welding wire containing 5% magnesium, which is a versatile general-purpose welding material, suitable for stuffy welding, high strength, good malleability, and good corrosion resistance.

5. Aluminum-magnesium alloy welding wire.

Performance characteristics: It is an alloy welding wire containing three percent magnesium, which is suitable for welding or table.

Welding wires are made of materials such as carbon steel, low-alloy structural steel, alloy structural steel, stainless steel, and non-ferrous metals.

Common argon arc welding wire structure:

1. GMT-SKD11 > HRC 56 58 Welding and repairing cold work steel, metal stamping die, cutting die, cutting tool, forming mold, and hard surface of the workpiece to make argon electrodes with high hardness, wear resistance and high toughness, heat and preheat before welding, otherwise it is easy to crack.

2. GMT-SKD61 > HRC 40 43 welding zinc, aluminum die-casting mold, good heat resistance and crack resistance, hot gas stamping die, aluminum-copper hot forging die, aluminum-copper die-casting mold, good heat resistance, wear resistance, crack resistance.

3. GMT-8407-H13 > HRC 43 46 Die-casting dies for zinc, aluminum, tin and other non-ferrous alloys and copper alloys, which can be used as hot forging or stamping dies. It has high toughness, abrasion resistance and good heat erosion resistance, high temperature softening resistance, good high temperature fatigue resistance, and can be welded for hot punches, reamers, etc. When doing heat treatment, it is necessary to prevent decarburization, and the hardness generated by the welding of hot tool steel is too high and cracking.

4. GMT-888T > HB 300 high hardness steel bonding, hard surface priming, crack welding. High-strength welding, containing high nickel-chromium alloy content, is used for anti-cracking and bottom welding, filling and filling without silver, strong tensile force, and can repair the crack welding and reconstruction of steel.

5. GMT-718 > HRC 28 30 mold steel for plastic products such as large household appliances, toys, communications, electronics, sports equipment, etc. The preheating temperature is 250 300 and the heating temperature is 400 500, and when multi-layer welding is repaired, the backward welding method is used to weld and repair, which is less likely to produce defects such as poor fusion and pinholes.

6. GMT-738 > HRC 32 35 Translucent plastic product mold steel, large mold, plastic mold steel with complex shape and high precision. Plastic injection mold, heat resistant mold, corrosion resistance mold, etching has good processability, easy cutting polishing and electric erosion, good toughness and wear resistance.

7. CU (argon welding copper) >HB200 This welding support is widely used, and can be used to weld electrolytic sheets, copper alloys, steel, bronze, pig iron, and general copper parts. It has good mechanical properties, and can be used for welding and repairing copper alloys, and can also be used for welding steel and pig iron, iron bonding.

8. CR steel welding wire > HRC 55 57 Punching die, cold work forming die, cold drawing die, punch, high hardness, high toughness, good wire cutting. Heat and preheat before welding, and do post-heating after welding.