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RESEARCH ON THE METAL POWDER-CORED WIRE FOR ROBOT WELDING OF BUILDING HIGH-PERFORMANCE STRUCTURAL STEEL Q460GJC
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摘要: 针对建筑高性能结构钢Q460GJC焊接的要求，研究了适合其机器人焊接的金属粉芯焊丝。该焊丝具有优良的送丝稳定性，熔滴从短路过渡向喷射过渡转变的临界电流为210~220 A，且焊后无需清理。焊丝熔敷金属由针状铁素体和贝氏体形成，拉伸断口由均匀的韧窝组成，冲击断口呈准解理断裂特征，并存在大量短而弯曲的撕裂棱；熔敷金属的抗拉强度为650 MPa，屈服强度为535 MPa，延伸率为25%，在20~-60℃温度范围内，冲击功大于150 J，扩散氢含量不高于4.0 mL/（100 g），符合T554T15-1M21AN2UH5焊丝型号的技术要求，适用于重要建筑钢结构中Q460GJC钢的机器人焊接。Abstract: It’s necessary to apply the technique of robot intelligent welding to steel structure industry. In this paper, the metal powder-cored wire for robot welding of building high-performance structural steel Q460GJC was researched. The wire has excellent wire-feeding stability. The critical current of droplet transition from short-circuit transition to spray transition is 210~220 A without cleaning after welding. Its deposited metal is formed by acicular ferrite and bainite. Its tensile fracture is composed of uniform dimple, and the impact fracture has the characteristic of quasi cleavage with a lot of short and curved tearing edges. The tensile strength of deposited metal is 650 MPa, the yield strength is 535 MPa and the elongation is 25%. And its impact energy is above 150 J at the temperature range from 20 ℃ to -60 ℃. The diffusible hydrogen is not more than 4.0 mL/100 g. Therefore, the metal powder-cored wire meets the technical requirements of T554T15-1M21AN2UH5, and it is suitable for robot welding of Q460GJC steel used in the important building steel structure.
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Key words:
- metal powder-cored wire /
- building structural steel /
- robot welding
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