20 How to weld seamless steel pipe and thin walled stainless steel pipe 304 ? 20 Seamless steel pip

Select the appropriate welding consumables and determine the process parameters.

Summary. Dear, hello, No. 20 steel is a high-quality low-carbon steel, just use ordinary welding rods. It can be welded with J422, J427, J507 and can also be welded with gas shielded welding.

J507, J427 are welded by reverse connection method, etc. If the strength grade of the welded material is different for steel pipes, the welding rod can be selected according to the steel grade with the lower strength grade.

If the pressure pipe Q345 is welded with the No. 20 steel pipe, it is best to use the electrode of J427 to weld.

What welding wire is used for 20 gauge steel seamless pipe.

Dear, hello, No. 20 steel is a high-quality low-carbon steel, just use ordinary welding rods. It can be used J422, J427, J507, and can also be welded with gas shielded welding. J507, J427 with reverse connection method welding answer, etc.

If the steel pipe with different strength grades of welding materials can be selected according to the steel grade with lower strength grades. If the pressure pipe Q345 is welded with the No. 20 steel pipe, it is best to use the electrode of J427 to weld.

What material is used for the second protection welding wire?

The welding wire contains sufficient alloying elements - silicon, manganese and other elements combined with deoxidation, and the following low carbon content. Welding materials: CO2 gas purity requirements; The water content does not exceed; The carbon content does not exceed.

Copper plating on the surface of the welding wire does not allow rust spots. The second welding process is suitable for low-carbon steel and low-alloy high-strength steel welding of various large-scale steel structure engineering, its welding productivity is high, the crack resistance is good, the welding deformation grip is small, and the range of bi-shaped adaptation is large, and it can be welded with thin plates and medium-thick rulers.

Answer]: B1) If you don't believe in the welding of high-fiber rust steel pipes, manual arc welding and argon arc welding can generally be used. In order to ensure that the inner wall is welded and formed smoothly, the thin-walled pipe can be welded with tungsten inert gas, and when the wall thickness is greater than 3mm, argon-electric combined welding should be used; The welding material should be similar to the chemical composition of the base metal, and the metal properties of the slip imitation weld and the intercrystalline corrosion performance of Nianxun should be not lower than that of the base metal.

Answer]: c. Stainless steel pipe welding can generally be done by manual arc welding and argon arc welding. In order to ensure that the inner wall is welded and formed smoothly, the thin-walled masking tube can be pure and pure using all-tungsten inert pants potato gas shielded welding, and when the wall thickness is greater than 3mm, argon electric combined welding should be used.

Answer]: B, see textbook p381).

Analysis] This question examines the industrial sail piping pipeline engineering. Stainless steel pipe welding can generally be done by manual arc car mega welding and argon arc welding. When the wall thickness is greater than 3mm, argon electric joint welding should be rented.

Answer] :d thin-walled pipes are welded with all-tungsten argon arc welding, and stainless steel pipes with a wall thickness greater than 3mm should be welded by argon electric Zhida joint welding.

Summary. The welding method of 19x2 seamless pipe and tube sheet can be adopted in the following two ways:1

Tubesheet Match-to-Tube Welding Method: First, the tubesheet and the seamless pipe are matched, and then the tubesheet and the seamless tube are welded together by welding method. This method is suitable for demanding piping systems, with strong welded joints and good sealing, but it requires a high level of craftsmanship and skill.

2.Welding throat method: one end of a 19x2 seamless pipe is beveled, then it is connected to the tube sheet, and it is welded together by the welding method.

This method is suitable for situations where the piping system is not demanding, and the cost of welded joints is low, but it may not be as good as the tubesheet butt-to-face welding method in terms of tightness and firmness. Regardless of which method is used, there are a few things to be aware of:1

Before welding, it needs to be cleaned and treated to ensure that the welding surface is clean and smooth; 2.Select the appropriate welding materials to ensure the firmness and sealing of the welded joints; 3.Control the welding temperature and welding time to avoid excessive or insufficient welding and affect the welding quality; 4.

Post-welding treatment, such as grinding, slag removal, etc., is carried out to ensure the smoothness and beauty of the welded joint. It should be noted that when welding seamless pipes and tube sheets, it must be operated in strict accordance with relevant specifications and standards to ensure welding quality and safety.

The welding method of 19x2 seamless pipe and tube sheet can be adopted in the following two ways:1Tubesheet Welding Method:

The tubesheet and the seamless tube are matched first, and then the tubesheet and the seamless tube are welded together by welding method. This method is suitable for demanding piping systems, with strong welded joints and good sealing, but it requires a high level of craftsmanship and skill. 2.

Welding throat method: one end of the 19x2 seamless pipe is beveled, and then its segment is connected to the tube sheet, and it is welded together by the welding method. This method is suitable for situations where the piping system is not demanding, and the cost of welded joints is low, but it may not be as good as the tubesheet butt-to-mouth welding method in terms of sealing the old burning mountain and firmness.

Regardless of which method is used, there are a few things to be aware of:1It is necessary to clean and treat before welding to ensure the cleanliness and smoothness of the welding surface of the CSI; 2.

Select the appropriate welding materials to ensure the firmness and sealing of the welded joints; 3.Control the welding temperature and welding time to avoid excessive or insufficient welding and affect the welding quality; 4.Post-welding treatment, such as grinding, slag removal, etc., is carried out to ensure the smoothness and beauty of the welded joint.

It should be noted that when welding seamless pipes and tube sheets, it must be operated in strict accordance with relevant specifications and standards to ensure welding quality and safety.

Ask the teacher for advice.

Okay, dear, take a look.

Answer] :d stainless steel pipe welding can generally be done by manual arc welding and argon arc welding. In order to ensure that the inner wall is welded and formed smoothly, the thin-walled pipe can be welded with tungsten inert gas, and when the wall thickness is greater than 3mm, argon-electric combined welding should be used; The chemical composition of the welding material should be similar to that of the base metal, and the metal properties and intergranular corrosion properties of the weld should be not lower than that of the base metal. Inclusive.