芜湖桥栓钉焊接技术

按芜湖桥栓钉焊接质量检验合格性试验的要求 ,介绍栓钉焊接工艺评定试验及试验结果 ,分析栓钉焊接缺陷产生的原因及修复方法 ,提出了栓钉焊接工艺要点     

日本管道管用高焊接性13%Cr激光焊接钢管的开发

日本NKK公司通过使用大功率激光焊接工艺开发生产出了高焊接性的13％Cr管线钢管。这种激光焊管实现了薄壁合金管在流体输送管道上的应用。该合金管的强度性能与API－X80级管线钢管相当，焊缝区试验表明，韧性和耐腐蚀性与母材相当，具有很好的特性。它将会成为CO2防腐领域的优质材料。     

焊后热处理对手工自蔓延焊接接头组织性能的影响

研究了不同的焊后热处理温度对手工自蔓延焊接接头组织形态的影响,以及由此引起的力学性能的变化.试验发现当退火温度大于300℃时能够达到元素的扩散激活能,随着温度的升高焊接接头的抗拉强度增加,冲击韧性增强,母材和焊缝合金在靠近熔合线处的显微硬度差距减小,熔合区组织更加均匀.通过对元素EDS能谱线扫描发现主要元素在熔合区的浓度由热处理前的突变转变为梯度过渡的形式,提高了熔合区的连接强度.     

铸铁焊接性能与工艺的分析讨论

阐述了铸铁焊接的难点。通过分析铸铁的成分和焊接的冶金过程，为不同的铸铁缺陷的补焊提供了合理的工艺方法及措施。     

Resistance welding of carbon fibre reinforced thermoplastic composite using alternative heating element

The focus of this work is the use of a metal mesh as an alternative heating element for the joining of carbon fibre fabric reinforced polyetherimide composite laminate. A more homogeneous temperature distribution was generated by the metal mesh at the bonding surface. Glass fibre fabric reinforced PEI (GF/PEI) was used as an electrical insulator between the heating element and adherend laminates. Experimental results show that the GF/PEI prepreg could effectively prevent current leakage and enlarge the welding area. Welding parameters, such as input power level, welding time and pressure, were optimized according to the results of mechanical and microstructure characterization. Mechanical performance of composite specimens joined using metal mesh, in terms of lap shear strength and Mode I interlaminar fracture toughness, was equivalent to that of compression moulded benchmarks. Fracture surfaces of welded specimens showed mostly cohesive failure or intralaminar failure, indicating that good bonding between the PEI matrix and metal mesh was achieved.     

电站锅炉排粉风机叶轮修复及强化工艺研究

在分析了电站锅炉排粉风机叶轮磨损原因的基础上，通过耐磨性试验优化了排粉风机叶轮表面强化方法和材料，叙述了排粉风机叶轮的氧乙炔焊强化工艺。实际使用结果表明：排粉风机叶轮经修复和氧乙炔喷焊强化后，其使用寿命比原等离子喷涂强化的新叶轮提高1倍以上。     

Synthetically quantitative evaluation function of characteristic parameters on CO_2 arc welding process

0　ＩｎｔｒｏｄｕｃｔｉｏｎＣＯ2 ｓｈｉｅｌｄｅｄａｒｃｗｅｌｄｉｎｇｉｓｏｎｅｏｆｅｃｏｎｏｍｉｃａｌｗｅｌｄｉｎｇｔｅｃｈｎｏｌｏｇｙｗｉｔｈｈｉｇｈｅｒｅｆｆｉｃｉｅｎｃｙ ,ｌｏｗｅｒｅｎｅｒｇｙｃｏｎｓｕｍｐｔｉｏｎａｎｄａｎｔｉ ｏｘｉｄａｔｉｏｎ ,ｂｕｔｉｔｈａｓｔｈｅｓｈｏｒｔａｇｅｓｏｆｔｏｏｍｕｃｈｓｐａｔｔｅｒｉｎｇａｎｄｕｎｓａｔｉｓｆｙｉｎｇｗｅｌｄｉｎｇｆｏｒｍａｔｉｏｎｔｈａｔｒｅｓｔｒａｉｎｉｔｓｆｕｒｔｈｅｒｐｏｐｕｌａｒｉｚａｔｉｏｎａｎｄａｐｐｌｉｃａｔｉｏｎ .…     

Study on general inverse kinematics of rotating/tilting positioner for robotic arc welding off-line programming

0　ＩｎｔｒｏｄｕｃｔｉｏｎＷｅｌｄｉｎｇｉｓａｎｉｍｐｏｒｔａｎｔａｎｄｐｏｐｕｌａｒｆａｂｒｉｃａｔｉｏｎｐｒｏｃｅｓｓｉｎｉｎｄｕｓｔｒｙ .Ｈｏｗｅｖｅｒ ,ｄｕｒｉｎｇｔｈｅｗｅｌｄｉｎｇｐｒｏｃｅｓｓ,ａｒｃ,ｆｕｍｅｓａｎｄｎｏｉｓｅｉｓｇｅｎｅｒａｔｅｄ ,ｐｒｏｄｕｃｉｎｇａｎｅｎｖｉｒｏｎｍｅｎｔｔｈａｔｉｓｕｎｐｌｅａｓａｎｔａｎｄｈａｚａｒｄｏｕｓｔｏｈｕｍａｎｈｅａｌｔｈ .Ｔｈｅｕｓｅｏｆｗｅｌｄｉｎｇｒｏｂｏｔｓｈａｓｉｍｐｒｏｖｅｄｔｈｅｈｕｍａｎｗｏｒｋｉｎｇｅｎｖｉｒｏ…     

A new method for welding aluminum alloy LY12CZ sheet with high strength

0　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｉｎｐｌａｔｅ ｓｈｅｌｌｓｔｒｕｃｔｕｒｅｓｏｆａｌｕｍｉｎｕｍａｌｌｏｙｗｉｔｈｈｉｇｈｓｔｒｅｎｇｔｈａｒｅｕｓｅｄｉｎｔｈｅｆｉｅｌｄｓｏｆａｅｒｏｎａｕｔｉｃｓａｎｄａｅｒｏｓｐａｃｅｍｏｒｅａｎｄｍｏｒｅｗｉｄｅｌｙ .Ｄｕｅｔｏｓｅｒｉｏｕｓｗｅｌｄｉｎｇｒｅｓｉｄｕａｌｓｔｒｅｓｓａｎｄｄｉｓｔｏｒｔｉｏｎ ,ｈｉｇｈｓｕｓｃｅｐｔｉｂｉｌｉｔｙｔｏｈｏｔｃｒａｃｋｉｎｇ ,ｌｏｗｓｔｒｅｎｇｔｈａｎｄｄｕｃｔｉｌｉｔｙｏｆｗｅｌｄｅｄｊｏｉｎｔ,ｔｈｅｆ…     

The Use of Fuzzy Logic in the Taguchi Method for the Optimisation of the Submerged Arc Welding Process

The use of fuzzy logic in the Taguchi method to optimise the submerged arc welding process with multiple performance characteristics is reported in this paper. An orthogonal array, the signal-to-noise ratio, multiresponse performance index, and analysis of variance are employed to study the performance characteristics in the submerged arc welding process. The process parameters, namely arc current, arc voltage, welding speed, electrode protrusion, and preheat temperature are optimised with considerations of the performance characteristics, including deposition rate and dilution. Experimental results are provided to confirm the effectiveness of this approach.