气焊一般用来评估焊接材料的腐蚀速率，评估这些材料在腐蚀环境中的使用。
Autogenous welds are commonly used to evaluate corrosion rates of welded materials and the usage of these materials in corrosive environments.
由于焊接金属与非焊接金属的腐蚀速率会不同，所以有必要研究两种情况。
Corrosion rates can vary between welded and non-welded metals, therefore it is advisable to study the behavior of both conditions.
起始裂纹在硬区的软对硬力学性能非对称焊接接头，起始裂纹越靠近软区，疲劳裂纹扩展速率越慢；
For CH joint, when the initial crack is located in hard zone, the closer the initial crack is to the hard soft interface, the slower the fatigue crack growth rate is.
应用推荐