桥连现象是波峰焊接过程中最常见的一种焊接缺陷，其影响因素是多方面的。
Bridge phenomenon is a frequent defect in wave soldering, which have many affected factors.
根据断裂力学及可靠性理论，提出了一种起重机焊接箱形梁存在裂纹缺陷的可靠度计算方法。
Based on fracture mechanics and theory of reliability, this paper offers the reliability calculation method for welded box beam having fracture.
第一种为声发射技术，用于发现焊接时出现的缺陷，比如在焊接过程中出现的焊接裂缝。
The first kind of these techniques is the acoustic emission technique which was applied to detect the welding defects such as welding cracks simultaneously during the process of welding in shipyard.
针对振动焊接中激振器的激振力不大、频带不宽等缺陷，本文研制了一种以超磁致伸缩激振器为执行元件的微振动平台。
The thesis aims to develop a micro-vibration platform using Giant Magnetostrictive Vibrator (GMV), which is expected to improve the vibrating force and frequency scale of vibration welding technic.
50kg液化石油气钢瓶是一种二类压力容器，焊接时不允许出现裂纹等缺陷。
The steel cylinders used for 50kg liquid-oil-gas are belong to pressure vessels of second category.
50kg液化石油气钢瓶是一种二类压力容器，焊接时不允许出现裂纹等缺陷。
The steel cylinders used for 50kg liquid-oil-gas are belong to pressure vessels of second category.
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