本发明公开了一种钢轨、贝尔岔心和尖轨的焊修方法及其焊丝。

The present invention discloses welding repair method and welding wire for steel rail, Bell frog and switch rail.

youdao

本发明公开了一种钢轨、贝尔岔心和尖轨的焊修方法及其焊丝。

The present invention discloses welding repair method and welding wire for steel rail, Bell frog and switch rail.

youdao