Corrosion resistance of nickel - base alloy spray welding layers after undergoing weld thermal cycle 带喷焊层钢管焊接接头热影响区耐蚀性能的研究
Using the heat of welding to vapour water , cooling rates are lowered on the weld bead and heat - affected zone 利用焊接时的加热使水汽化，不仅使焊道而且使热影响区的冷却速度减慢。
Minimal the tendency of microcracks can be obtained by improving the shape of weld pool and enhancing the welding energy input 通过改善焊缝成形和提高焊接线能量有助于减小两类热影响区微裂纹倾向。
The effect of the structure of austenite zone on the performance of gray iron welding joint is studied by means of thermo - simulated test in this paper 摘要采用热模拟试验方法探讨了灰口铸铁焊接接头热影响区的奥氏体区组织对接头性能的影响。
It is observed that considerable liquation microcracks and some other microffissures called solid - state microcrack initiate in the regions nearby the fusion line and propagate across the grain boundary 研究发现，熔合线附近的热影响区产生大量液化裂纹和沿晶扩展的固相裂纹。
The microfissuring behaviors in the heat - affected zone ( haz ) of electron beam ( eb ) welded nickel - based superalloy gh 4133 have been studied by using analytical scanning electron microscopy ( sem ) 摘要利用金相分析和扫描电镜对镍基高温合金电子束焊接热影响区微裂纹行为进行了分析。
Influences of scratches and long reserve time on identification reliability were discussed ; then , the influences of barcode depth , barcode roughness and the area of heat on surface quality were studied 研究了条码划伤和刀具储存等对识别可靠性的影响，以及条码标刻深度、表面粗糙度和热影响区等对表面质量的影响。
Test results show that the formation of protective nut by laser welding have narrow heat affect zone and minimum organization grow up inclination , gentle hardness gradient , and the protective cover is nearly not out of shape 研究结果表明，防护螺母激光焊接成形具有最窄的热影响区和最小的组织长大倾向，硬度梯度平缓，且防护罩几乎没有变形。
At the same time , the depth of die heat affected zone ( haz ) transfer law and influential mechanism of temperature wave have been analyzed , which lay a foundation for further research of temperature field and thermal stress filed of die 同时分析了温度波在模具中的传递规律，热影响区范围与影响机理，为进一步开展锻模温度场与热应力场的研究提供了基础。
The results show that , when the hardfacing process is not appropriate , the thick martensite structure with high carbon content will form in the overheat region of heat affected zone , and the high residual stress occurred , which are the primary causes resulting in crack 结果表明，堆焊工艺制定不当，热影响区的过热区形成高碳粗大马氏体组织及保留了较大的焊接应力，是导致堆焊层开裂的主要原因。
