Technical application of high-strength S690 steel profiles | Advanced high-strength steel structural Sections, ultra-high-strength steel structural Sections, Super Duplex/stainless steel structural Sections, special Sections, composite steel structural Sections, laser-welded steel Sections

Technical application of high-strength S690 steel profiles 2023-12-12

S690 high-strength structural steel Due to the material’s higher strength properties, the use of S690QL will promote a more streamlined design of the structure, improve load capacity and energy efficiency. High-strength steel profiles continue to develop in the direction of low-cost and high-performance, which expands the application scope of S690 high-strength steel.
S690 structural steel profiles are widely used in engineering machinery, offshore drilling platforms, coal mining machinery, construction, bridges, amusement facilities and offshore wind power generation industries. The solution to the welding problems of these high-strength materials is the prerequisite to ensure their large-scale application.

The welding problems of S690 high-strength steel mainly focus on the crack susceptibility and the mechanical properties of the welding heat-affected zone. After welding, high-strength steel will undergo microstructural changes in the heat-affected zone, which may lead to a reduction in its mechanical properties, so it is necessary to Strictly controlling the heat input, laser welding of Huanggang Special Steel can solve the problem of stability of mass production of high-strength steel welding.

S690 high strength weldability analysis and welding process requirements
Welding inspection and quality assurance of S690 high-strength steel
S690 High-strength steel welding process qualification, welding operation technology application

Advantages and stability of laser welding high-strength steel profiles:

After S690 high-strength steel is welded with laser welding equipment, a welding position with equivalent mechanical properties to the base material can be obtained. Not only does the welding position have high strength, but it also has good toughness and crack resistance. After welding, tensile specimens are made transversely along the weld. The weld metal is located in the center of the sample. The tensile results show that the bit strength of laser welding is not lower than that of the base metal, and the plasticity and toughness are better than those of electrode arc welding and gas shielded welding, and are close to the properties of the base metal.

Laser welding has a small weld structure and a narrow heat-affected zone. Welding cracks do not always propagate along the weld or heat-affected zone, but often extend into the base metal.
Judging from the distribution of hardness and microstructure in the joint area, laser welding has higher hardness and steeper hardness gradient, which indicates that there may be greater stress concentration. However, in the area with higher hardness, corresponding to the fine structure, the symbiotic effect of high hardness and fine structure makes the joint have both high strength and sufficient toughness.

Peak Kong Special Steel supplies laser welded S690 piling I-beams, S690 structural profiles, S690 I-beams, S690H-shaped steels, S690 channel steels, S690 angle irons, S690 unequal angle steels and other non-standard high-strength customizations for the Hong Kong/Macau market.

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