Quality and schedule of group welding on site has been improved through pre-assembly.
通过预组装，施工现场组焊质量和周期得到了保证。
But it is also very dangerous because burn-through might happen during welding.
但是在役焊接时可能发生烧穿，有很大危险性。
But it is also very dangerous because burn-through might happen during welding.
但是在役焊接时可能发生烧穿，有很大危险性。
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