Square tube welding methods and techniques

Square tube welding methods and techniques:

Classification of square tubes:
Square tube refers to a steel tube with a square or rectangular cross-section, which is usually used to make furniture, building structures, etc. According to different uses, square pipes can be divided into three categories: light, medium and heavy. The common material standard for square tubes is ASTM A500.

Welding method of square tube:
1. Manual arc welding
Manual arc welding is a common welding method that requires the use of a welding machine and a welding rod. When welding, the two ends of the square tube need to be processed into groove shapes first, and then the grooves are closely connected together, and then arc welded.

2. Gas shielded welding

Gas-shielded welding refers to a welding method that uses gas shielding. Carbon dioxide, argon or their mixed gases are usually used as shielding gases. During welding, both ends of the square tube need to be processed into bevel shapes, and then a protective gas is used to protect the welding area before welding.

3. Submerged arc welding
Submerged arc welding is also a commonly used welding method, which requires the use of a submerged arc welding machine and welding wire. When welding, the two ends of the square pipe need to be processed into groove shapes first, and then the welding wire is placed in the middle of the groove, and then a submerged arc welding machine is used for welding.

Preparation before welding:
Before welding, attention needs to be paid to cleaning and treating the surface of the square tube. First, remove oil and rust from the surface. It is recommended to use a wire brush for treatment. Secondly, the pipe mouth should be polished flat to avoid affecting the joint state during welding.

Welding skills mastery:
1. Intermittent spot welding method: By reducing the length of the arc, moving back and forth within a certain period of time, welding on adjacent points. This method is suitable for welding thick-walled pipes.
2. Horizontal (vertical) welding method: When semi-automatically welding the square tube longitudinally (transversely), you should first perform centering, adjust the displacement, plan the welding path, and strengthen the weld seam.

Issues and techniques you need to pay attention to when welding:
1. The inside and outside of the square tube need to be cleaned before welding to avoid affecting the welding quality.
2. The welding area needs to be polished before welding to ensure smooth welding.
3. During manual welding, the welding current and voltage need to be controlled to ensure the quality of the weld.
4. During gas shielded welding, the gas flow and pressure need to be controlled to ensure the quality of the weld.
5. During submerged arc welding, the welding speed and current intensity need to be controlled to ensure the quality of the weld.
6. When welding, you need to protect your eyes and skin to avoid arc damage.
7. If important structural parts need to be welded, it is recommended to find a professional welder to ensure the welding quality.

Summarize:

This article introduces the classification, welding methods and techniques of square pipes, including manual arc welding, gas shielded welding, submerged arc welding and other welding methods, and shares the issues and techniques that need to be paid attention to during welding. If you need to weld square pipes, it is recommended to choose the appropriate welding method according to the specific situation and pay attention to safety.

Go here to learn more: ASTM A500 square tube