The "Guidelines for the Development of China's Iron and Steel Science and Technology 2006-2020" clearly states that the production of high-strength and high-toughness steels with a yield strength of 400-800MPa and a tensile strength of 600-1400MPa will be gradually stabilized, as well as the so-called 21st-century super steel with a strength increase of 1-4 times. With the promotion and application of high-strength steel and ultra-high-strength steel, the traditional welding design concept will be impacted. The continuous development and evolution of steel will inevitably put forward new and higher requirements for steel structure welding technology, thereby promoting the innovation and progress of Welding Button Contact technology.
Therefore, new steel grades will emerge in an endless stream. All kinds of high-strength building structural steel, ship plate steel, pressure vessel steel, pipeline steel, bridge steel, heat-resistant steel, and low-temperature steel will be further sublimated along the development path of the "Bird's Nest" Q460E-Z35 steel. Through advanced processes such as liquid steel refining and controlled rolling and controlled cooling (TMCP), they will develop in the direction of "low carbon, micro-alloying, purification, and fine graining" to improve the strength and toughness of steel. This will be the basic technical route for the development of my country's steel industry. As a key link in connecting these high-performance steels, the improvement of the welding contact point technology will directly affect the stability and reliability of the entire steel structure.
GB50661 "Steel Structure Welding Code" conforms to the development trajectory of my country's building steel structure technology, clarifies the types and applications of high-strength steel, and makes steel structures steel develop in a more advanced direction. This will inevitably promote the transformation of welded steel structures and then drive the innovation of welding contact point technology. The optimization of Silver Contact Welding will provide a strong guarantee for the performance improvement of steel structures so that they can play a greater role in buildings, bridges, ships, and other fields.
High-strength steel usually refers to steel with a yield strength greater than 400MPa and a yield strength ratio greater than 0.85, which is manufactured with weldability in mind. The embrittlement of high-strength micro alloyed controlled rolling and cooling steel's heat-affected zone is a critical weldability issue. Generally, the greater the heat input, the more severe the embrittlement tendency. The embrittlement problems of HAZ mainly include embrittlement of the coarse-grained zone (CGHAZ), embrittlement of the intercritical heat-affected zone (ICHAZ), embrittlement of the intercritical coarse-grained heat-affected zone (IRCGHAZ) during multi-layer welding, embrittlement of the overcritical coarse-grained heat-affected zone (SRCGHAZ), and embrittlement of the subcritical coarse-grained heat-affected zone (SCGHAZ). Among them, the embrittlement of CGHAZ, IRCGHAZ, and SCGHAZ is the area that should be paid the most attention to when welding micro-alloyed steel. The welding quality of the Welding Component in these areas directly affects the safety and stability of the entire structure, so higher requirements are placed on the welded silver contact technology.
Due to the high-performance characteristics of high-strength steel thick plates, there are high requirements for welding equipment, welding materials, and cutting and welding processes, especially for the first-time qualified rate of cutting and welding seams, otherwise, the quality of welds is difficult to guarantee. The quality control of welding contacts has become the key to ensuring the success of the entire welding project. Advanced welding technology and equipment are needed to improve the performance and reliability of Welding Electrical Contacts.
It is completely reasonable to say that the large-scale use of high-strength steel in steel structures will promote the technological progress of the entire welding industry, produce a huge leap, and bring huge business opportunities. As an important part of welding technology, the improvement and perfection of Welding with Contacts will inject new vitality into the development of the entire welding industry and promote the prosperity and progress of related industries.
As we all know, a revolution will bring great changes. Various factors will lead to a strong combination of excellent assets and bring competition; success and failure go hand in hand, and opportunities and risks coexist; in the face of the upcoming revolution, it takes courage and courage to charge forward; it takes wisdom and resilience to strategize and win thousands of miles; it takes more courage and hard work to catch up with the world's advanced level. The innovation and development of welding contact technology will enable the Resistance Welding Contacts industry to occupy a favorable position in this transformation, seize opportunities, meet challenges, and achieve greater breakthroughs and development.
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