Stainless steel welding methods and skills Stainless steel electrode welding methods and skills

1.Welding of the base. The base weld must not touch and melt the composite material.

When the substrate is welded first, the root or surface of the weld should be 1-2mm away from the composite interface. The residual height of the weld shall comply with the provisions of the relevant standards. Depending on the substrate thickness, steel grade and structure, appropriate preheat treatment can be applied if necessary.

2.Transition layer welding. When welding the transition layer, it is necessary to minimize the melting amount of the base metal and reduce the fusion ratio on the premise of ensuring good fusion. Therefore, a smaller diameter electrode or wire should be used with a smaller wire energy. The thickness of the transition layer should not be less than 2mm.

3.Welding of cladding. When welding the cladding layer, attention should be paid to protecting the surface of the cladding layer to prevent welding spatter from damaging the surface of the cladding layer, and it is not allowed to make arcs, welding scars, lifting rings and temporary supports on the surface of the cladding layer at will.

The surface of the cladding weld should be as flat and smooth as possible. The ultra-high height of the butt weld is not more than millimeters.

1. Stainless steel electrode welding methods and skills.

2. Stainless steel weld treatment method.

3. Stainless steel spot welding methods and skills.

4. TIG welding and welding skills of thin stainless steel.

1.Welding methods include DC argon arc welding, hand arc welding, hard brazing and soft brazing, general stainless steel doors and windows, stainless steel decoration, etc. can be welded by DC argon arc welding machine, stainless steel welding needs to be cleaned before welding, remove the oil and water left.

Welding type method:

1. Electrode arc welding

Principle - an arc welding method for welding with manually operated electrodes. A stable burning arc established between the electrode and the weldment is used to melt the electrode and weldment, resulting in a strong welded joint. It belongs to the joint protection of gas slag.

Main features - flexible operation; Low assembly requirements for the welded joint; Wide range of weldable metal materials; Low welding productivity; Weld quality dependence (depends on the welder's operational skills and on-site performance).

Application - Widely used in shipbuilding, boilers and pressure vessels, machinery manufacturing, building structures, chemical equipment and other manufacturing and maintenance industries. It is suitable for welding of various metal materials, various thicknesses and various structural shapes (in the above industries).

2. Submerged arc welding (automatic welding):

Principle – The arc burns under the flux layer. A weld is formed by melting the wire, flux, and base metal (weldment) using the heat generated by the burning arc between the wire and the weldment. Slag protection.

Main features - high welding productivity; Welding seam***; Low welding cost; good working conditions; Difficult to weld in a spatial position; High requirements for the assembly quality of weldments; It is not suitable for welding thin plates (when the welding current is less than 100A, the arc stability is not good) and short welds.

Application——Widely used in shipbuilding, boilers, bridges, lifting machinery and metallurgical machinery manufacturing. Submerged arc welding can be used for weldments where the weld can be kept in a horizontal position or the angle of inclination is not large. The thickness of the plate should be greater than 5 mm (burn-through resistant).

Welded carbon structural steel, low-alloy structural steel, stainless steel, heat-resistant steel, composite steel, etc.

3. Carbon dioxide gas shielded welding (automatic or semi-automatic welding):

Principle: Melting electrode arc welding method using carbon dioxide as shielding gas. Atmospheric protection.

Main features - high welding productivity; Low welding cost; Small welding deformation (arc heating concentration); High welding quality; Simple operation; High spatter rate; It is difficult to solder with AC power; Poor wind resistance; Non-ferrous metals that are susceptible to oxidation cannot be welded.

4. MIG MAG welding (molten inert gas active gas shielded welding):

MIG welding principle - an arc welding method that uses inert gas as shielding gas and welding wire as melting electrode. The shielding gas is usually argon or helium or a mixture of them. MIG uses inert gas, MAG adds a small amount of active gas, such as oxygen, carbon dioxide, etc., to the inert gas.

5. TIG welding (tungsten inert gas shielded welding).

Principle - under the protection of inert gas, the arc heat generated between the tungsten electrode and the weldment is used to melt the base metal and the filled welding wire (or without filling the welding wire) to form a welding seam. The electrode does not melt during the welding process.

6. Plasma arc welding.

Principle - with the help of the water-cooled nozzle on the arc constraint effect, obtain a high energy density plasma arc for welding.

In most cases, direct current is used for welding, and the electrodes act both as an arc carrier and as a filler material for the weld. The electrode consists of an alloy or unalloyed metal core wire and a welding rod. The electrode can be either titanium or tight, depending on the thickness and composition.

2. MIG MAG welding: This is an automatic gas arc welding method. In this method, the arc is soldered between the current carrier wire and the workpiece under shielding gas shielding.

The company was founded in 2004, specializing in the processing and production of stainless steel signs, and has many years of experience in stainless steel processing in Qinghai, and the products are finely worked, which has been praised by the majority of customers. Extended information: The welding process is related to the welding method and other factors, and the operation needs to be determined according to the material, grade, chemical composition, weldment structure type, and welding performance requirements of the welded workpiece.

First of all, it is necessary to determine the welding method, such as hand arc welding, submerged arc welding, tungsten argon arc welding, MIG/MAG welding, etc., there are many types of welding methods, which can only be selected according to the specific situation. After determining the welding method, the welding process parameters are formulated, and the types of welding process parameters are different.

It is mainly manual welding, followed by metal gas arc welding and tungsten inert gas welding.

The flat characteristics of the welding power supply are adopted, and the reverse polarity is used in DC welding. You can use a general CO2 welding machine to weld, but the pressure of the wire feed wheel should be slightly loosened, the shielding gas is generally carbon dioxide gas, the gas flow rate is more suitable for 20 25L min, the distance between the welding nozzle and the workpiece is 15 25mm, the welding current is about 15mm when it is below 250A, and about 20 25mm when it is above 250A.

1. Welding of the base layer. When the base material is welded first, the root or surface of the weld bead should be 1-2mm away from the composite interface. The residual height of the weld should comply with the provisions of the relevant standards.

Depending on factors such as substrate thickness, steel grade, and structure, appropriate preheating treatment can be applied if necessary.

2. Welding of transition layer. When welding the transition layer, it is necessary to minimize the amount of melting into the base metal and reduce the fusion ratio on the premise of ensuring good fusion. For this purpose, a smaller diameter electrode or wire and a smaller wire energy should be used. The thickness of the transition layer should not be less than 2mm.

3. Welding of multiple layers. When welding the lamination, it is necessary to pay attention to protecting the surface of the lamination, preventing welding spatter from damaging the surface of the lamination, and shall not arbitrarily trigger the arc, weld karan, lifting ring and temporary bracket on the surface of the lamination. The surface of the laminated weld should be as smooth and smooth as possible with the laminated surface.

The residual height of the butt weld is not greater than.

Summary. This question is up to me, it takes a little time to type, so please be patient.

This question is up to me, it takes a little time to type, so please be patient.

Stainless steel welding methods include manual welding (MMA), MIG MAG welding, TIG welding, gas welding, hand arc welding, submerged arc welding, tungsten argon arc welding, MIG/MAG welding, etc. There are many types of welding methods, which can only be selected on a case-by-case basis. Its common methods are manual welding (MMA) and MIG MAG welding.

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