The existence of grey spot may cause brittle crack of the joint, therefore, controlling grey spot occupy a decisive position to ensure the quality of railresistance welding.
灰斑的存在易导致接头的脆性断裂。因此，控制灰斑对保证钢轨接触焊质量举足轻重。
2
Because of that both the grey spots and the performances of the railresistance welding joints are under the synthetical influence of many parameters, the orthogonal design was used to settle tests.
由于钢轨接触焊接头灰斑与性能受众多参数综合影响，故采用正交设计安排试验。
3
The key is that to resolve the interaction between bridge and track, that the mechanics model of this interaction, as well as rail longitudinal resistance to displacement between rail and beam.