中国焊接资讯网(www.weldinfo.net)的建设

针对中国焊接资讯网的现状，提出了重新构筑的技术方案，强调了网站在焊接专业的市场定位，明确了需要实现的数据库、电子商务等各项服务功能，其要点正在逐步实施中。     

埋弧焊管生产中母材与焊接材料相匹配对气孔的影响

通过对不同厂家生产的X65级和Q235钢材与不同的焊接材料相匹配所生产的螺旋埋弧焊管焊缝内的气孔进行统计分析 ,并从钢材中氧含量的多少及其焊接材料匹配的不同 ,来研究焊缝中气孔产生的原因     

Examination of deposited layers on support rollers of continuous casting installations

Numerical methods are used to investigate the changes in the thermomechanical state of the region of the welded joint in dissimilar steels in a wide temperature range. The effect of edge preparation of the welded joint on the formation of residual stresses and strains in the welded joint in two-layer steels with different physical–mechanical and service properties is investigated. The calculation results are in agreement with the experimental data.     

蒸球焊缝裂纹浅析

通过对在用蒸球焊缝裂纹的分析,发现其主要产生原因是使用工艺的改动使容器局部温差应力增大,导致焊缝出现疲劳裂纹,并提出相应的改造方案,对蒸球的使用管理和压力容器检验有一定的借鉴作用.     

J55钢级焊接油井管在线控冷工艺的研究

针对一种J55钢级焊接油井管的生产工艺新流程,在搭建的冷却工艺试验平台上研究了冷却速率、加热速率和喷淋方式对钢管微观组织和机械性能的影响。结果表明:热张力减径工序后采用加速冷却,有利于钢管机械性能的提高;提高焊管热张力减径前的再加热速率,有利于钢管机械性能的提高;切圆喷淋的冷却方式能大大提高钢管的冷却均匀性。     

热壁加氢反应器堆焊层裂纹的检测与监测

叙述加氢反应器堆焊层裂纹的检测技术和在不卸催化剂的情况下，从外壁进行检查并对堆焊层裂纹的高度进行监测的研究成果。该技术经实验验证，具有较高的精度，结果比较理想。     

管线钢宽板拉伸试验探讨

介绍了国内外宽板拉伸试验研究的进展情况,以及管线钢宽板拉伸试验的试验过程和数据处理方式,包括缺陷的制备、试样规格及信号采集、试验结果和试验数据的处理分析,并指出了影响宽板拉伸试验过程中的关键因素。通过多年的实践认为,宽板拉伸试验应建立一套完善的测试步骤和理论分析技术,规范化、标准化宽板拉伸试验过程,确保各种测量数据和试验结果更加真实可靠,为管道设计和焊接施工提供真实可靠的数据支持,对于指导宽板拉伸试验及管道应变设计具有一定的实际意义。     

Multicycle fatigue strength of welded joints of steel S500MC

Microcracking susceptibility in the dissimilar multipass weld metal of alloy 690 and low-alloy steel A533B was evaluated, and the effect of dilution on hot cracking (ductility-dip and liquation cracking) behaviour was investigated. In order to simulate the dissimilar multipass weld metal of alloy 690 to A533B steel, the A533B plate was welded under various dilution ratios using alloy 690 filler metal with different contents of P and S. Several weld metals, which had different alloy compositions at the fixed (P+S) content, were manufactured, and then ductility-dip and liquation cracking susceptibilities of the reheated weld metals were evaluated by the spot-Varestraint test. Ductility-dip cracking susceptibility heightened as the dilution ratio was increased even when the amounts of P and S were fixed. The increased dilution ratio (contamination of Fe into the weld metal) should reduce the tortuous character of the grain boundary (GB) due to inhibiting the constitutional supercooling (the instability of the solidification boundary), as well as enhance the GB embrittlement due to promoting the GB segregation of P and S. Furthermore, the liquation cracking susceptibility slightly heightened with an increase in the dilution ratio at the fixed (P+S) content. The increased liquation cracking susceptibility would be attributed to the enhancement of solidification segregation of P and S with increasing the dilution ratio.     

Economic advantages of replacing obsolete welding equipment in enterprises

The efficiency of replacing VDU-506 welding equipment with the PDGO-5278 wire feed system by the FastMig KM500 power source and the MF33 wire feed system supplied by Kemppi Oy is confirmed.     

高速MAG焊焊枪的设计优化

采用GAD／CAM技术对高速MAG焊焊枪结构者了设计，使用FEM数值计算方法对焊枪结构气体通道等部分进行了设计优化，制造出来的焊枪经焊接工艺实验检验，符合高速MAG焊焊接工艺的要求。