自动管板氩弧焊机在换热器生产上的应用

介绍了WMZ1 31 5型管子管板全位置数控脉冲氩弧焊机在换热器的管子与管板接头焊接中的应用 ,对手工氩弧焊和自动管板焊接进行了对比分析讨论     

锆材管件的失效分析

某化工企业装置中,其锆材(Zr702)管件在生产过程和停车检修时均发现裂纹,并且裂纹已经贯穿管壁。根据对出现裂纹的管件进行断口分析和能谱分析可知,锆管的开裂是沿晶开裂。引起锆管开裂的因素包括力学因素、焊接因素以及温度、介质因素等。     

阳极炉炉口检修焊接裂纹的处理

在冬季检修过程中,阳极炉炉口与炉体对接焊缝出现焊接裂纹。对裂纹产生的原因进行了分析,并提出了相应的解决措施。     

Physicochemical and thermophysical properties of CaO–TiO2–SiO2–Na3AlF6 system based electrode coating for AUSC power plant

The aim of this study is to investigate the physicochemical and thermophysical properties of CaO–TiO₂–SiO₂–Na₃AlF₆ based electrode coating developed for the welding of advanced ultra-supercritical (AUSC) thermal power plant components. The extreme vertices approach has been used to create twenty-six electrode coating compositions. Various physicochemical and thermophysical properties were characterized using experiments. The coating properties are essential in ensuring sound weld with desirable in-service performance. The developed coating's structural behavior was analyzed using Fourier transformation infrared spectroscopy (FTIR) and X-ray diffraction (XRD). In addition, regression analysis was carried out to evaluate the influence of coating constituents. Individual constituents and their interaction were found to have a prominent role in influencing the physicochemical and thermophysical properties.     

冷却机机头大直径法兰的焊接工艺

通过对不锈钢大直径法兰焊接过程中出现的裂纹及变形进行分析,提出了防止焊缝裂纹及焊接变形的工艺措施。     

Investigation of the stability of melting and electrode metal transfer in consumable electrode arc welding using power sources with different dynamic characteristics

The results of investigations carried out to study the effect of the dynamic characteristics of power sources on the stability of melting and electrode metal transfer to the weld pool in consumable electrode arc welding are presented. It is shown that when using a new generation of welding inverter power sources the heat and mass characteristics change and this has a decisive effect on the heat content of the weld pool, reduces the level of residual stresses in the heat-affected zone (HAZ) and also increases the susceptibility to reducing the size of structural components in the zone of permanent welded joints.     

复合尼龙附耳薄壁圆筒件超声波焊接破裂分析与解决

介绍了尼龙玻纤复合材料带饶性的薄壁圆筒件超声波焊接时,出现的破裂情况.并对其原因进行了分析.采取有效措施解决了焊接破裂问题,使焊接零件完全合格.     

换热器管板的焊接变形与控制

换热器是化工企业中常见的设备,在其制造及维修过程中,有时会出现管板变形,造成密封面紧固不严。对管板焊接变形现象作了简要探讨。     

浅谈钢轨气压焊接头的质量控制

叙述了影响铁路无缝线路钢思气压焊接头质量的诸因素,提出改善和控制焊接质量的措施与方法。     

工艺参数对Sn-0.3Ag-0.7Cu/Cu焊点界面组织和力学性能的影响

互连焊点界面反应形成的金属间化合物(IMC)对焊点服役可靠性会产生显著影响。研究了不同工艺参数(回流温度、回流时间和回流次数)条件下,Sn-0.3Ag-0.7Cu/Cu焊点界面金属间化合物的演变及对焊点力学性能的影响,同时对焊点断裂机制进行了分析。结果表明,随着回流温度和回流时间的增加,金属间化合物η-Cu6Sn5相的形貌由贝状向板条状转变,并可观察到η相溶入焊点内部。在265℃回流时,随着回流时间增加,贝状η相不断长大,晶粒数不断减少;界面IMC的生长符合幂指数生长规律,其生长指数为0.339。回流次数对焊点剪切强度的影响为先增后减,断裂模式从纯剪切断裂到微孔聚集型断裂再到局部脆断转变。