How To Weld Boiler Tubes?

Boiler tube refers to steel with openings at both ends and hollow sections, and the length is relatively large compared to the surrounding area. According to the production method, they can be divided into seamless steel pipe and welded steel pipes. Boiler tubes are key components for conveying high-temperature and high-pressure fluids, and their welding quality is directly related to the safety and reliability of the equipment. So how to weld boiler tubes?

Welding wire for boiler tube welding

When choosing welding wire for boiler pipe welding, it is necessary to select suitable welding wire according to the material, strength and other characteristics of the welding material. Commonly used welding wires include ER50-6, ER70S-6 and ER80S-G.

1. ER50-6 welding wire

ER50-6 welding wire is a carbon steel welding wire, the main components of which are carbon, manganese, silicon, etc., with good fluidity and crack resistance. It is suitable for welding ordinary carbon steel, low alloy steel and other materials.

2. ER70S-6 welding wire

ER70S-6 welding wire is also a carbon steel welding wire, but it contains higher manganese, silicon, vanadium and other elements. It has good welding performance and mechanical properties and is suitable for welding various structural steels.

3. ER80S-G welding wire

ER80S-G welding wire is a low alloy steel welding wire, the main components of which are chromium, molybdenum, manganese, etc. It has excellent corrosion resistance and is suitable for welding high strength and high corrosion resistance materials.

Welding rods for boiler tube welding

Boiler tubes are generally made of carbon steel or alloy steel. The following welding rods are commonly used for welding:

1. Carbon steel welding rod: suitable for welding of general carbon steel boiler tubes, such as E6010, E6011, E6013, E7018, etc.

2. Low alloy steel welding rod: suitable for welding steel containing alloy elements, such as E8016-B2, E8018-B2, etc.

3. Stainless steel welding rod: suitable for welding of stainless steel boiler tubes, such as E308, E309, E316, etc.

Welding methods for boiler tubes

1. Manual arc welding

Manual arc welding is the most common and simplest welding method, suitable for welding small workpieces. The method is to use an arc to melt the welding material (welding wire) and the two ends of the workpiece, and achieve the welding purpose through fusion and cooling solidification.

2. Gas shielded welding

The welding material of gas shielded welding is welding wire. Its advantages are that it improves the welding speed and quality, while reducing the generation of oxidation and welding slag, which can be applied to the welding of boiler tubes.

3. Submerged arc welding

Submerged arc welding is a method of placing the welding rod in the weld position, burying it under the welding part, and then heating it with a melting arc to melt the welding rod and the workpiece to achieve welding.

Welding process of boiler tubes

In the welding of boiler tubes, the characteristics of the tubes should be fully understood, and appropriate welding methods should be selected according to the different materials. Usually, when selecting welding materials, it is necessary to comprehensively consider factors such as the strength, ductility, and corrosion resistance of the materials to ensure the welding quality.

During the welding process, attention should also be paid to the control of parameters such as welding temperature, current, and time, as well as the cleaning and polishing of the weld to ensure the welding quality.

Summary

In short, when choosing welding wire for boiler pipe welding, you should choose the appropriate welding wire according to the actual situation, and when choosing welding rods, you need to choose according to the specific materials and welding requirements to ensure the welding quality and connection strength. At the same time, you should pay attention to the welding parameters and temperature control during the welding process to ensure the welding quality.