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Production of high-quality precision welded tubes

Published Time:

2018-07-17

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Summary

A crucial aspect of the quality of precision welded tubes is the removal of burrs from inside the weld seam. Due to spatial constraints, the removal of internal burrs in small-diameter welded tubes has always been a technical challenge in the welded tube manufacturing industry. Therefore, selecting a suitable welding method from the welding technology aspect is an effective way to solve the problem. Welding methods that produce welds with small internal burrs include direct current welding and square wave resistance welding. These welding methods are characterized by uniform heating, smooth weld seams, good quality, and the formation of very small internal burrs, generally only 0.1～0.2㎜.

1. Producing precision welded tubes with minimal internal burrs:

　　A crucial aspect of precision welded tube quality is the removal of internal weld burrs. Due to spatial constraints, removing internal burrs from small-diameter welded tubes has always been a technical challenge in the welded tube manufacturing industry. Therefore, selecting a suitable welding method from the welding technology aspect is an effective way to solve the problem. Welding methods that produce welded tubes with minimal internal burrs include direct current welding and square wave resistance welding. These welding methods are characterized by uniform heating, smooth welds, high quality, and minimal internal burr formation, generally only 0.1～0.2㎜.

　　2. Production of high-precision, ultra-thin-walled welded tubes using micro-beam plasma technology:

　　Welding ultra-thin-walled welded tubes using the micro-beam plasma method results in a bright and smooth outer weld seam, a flat and dense inner weld seam, and an average burr height of no more than 0.031～0.020㎜. The ovality of the outer diameter of the welded tube after welding is 0.10～0.23㎜, and the wall thickness difference is 0.020～0.034㎜. After cold rolling, the excessive ovality of the outer diameter is effectively eliminated, and the wall thickness difference reaches 0.002～0.007㎜, meeting the quality standards of precision seamless thin-walled tubes. After heat treatment, it has the same microstructure and properties as seamless tubes, while the economic superiority of producing ultra-thin tubes using seamless tubes is far less than that of ultra-thin tubes produced by welding and then cold rolling.

　　3. High-strength welded tubes for the automotive industry:

　　In recent years, the automotive industry at home and abroad has promoted automotive lightweighting to save energy, urgently needing to replace solid parts with high-strength hollow components. Developing high-strength welded tubes to replace seamless tubes to meet the needs of the automotive industry is technically feasible. In the development of high-strength welded tubes for the automotive industry, Japan has successively developed C-Ti-B, C-Mn-Nb, and C-Cr-AI-B steel series, and has adopted different heat treatment systems, such as annealing, normalizing, and quenching and tempering, according to different usage purposes. The standard strength grades for high-strength welded tubes used in the automotive industry include 561MPa, 637MPa, and 980MPa. In addition to high strength, the welded tubes are also required to have high plasticity, good processability, hardenability, toughness, and fatigue strength.

Keywords:

Steady and healthy development of the national economy

National 16Mn steel pipe index changes

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