Based on the analysis of site welding, the main welding defects are lack penetration, lack fusion, slag inclusion and porosity.
从现场施工情况分析，焊接的内部缺陷主要有未焊透、未熔合、夹渣和气孔等几种。
It is freely supported on the support beams of economizer to avoid the site welding between fixing arrangement and support beams.
该设计采用框架式省煤器固定结构，并自由支承在省煤器支承梁上，以避免固定装置与支承梁的现场焊接。
Blowout preventing lines shall be connected by threads and standard flanges, and on site welding is forbidden. Field welding is not permitted.
防喷管线应采用螺纹与标准法兰连接，不允许现场焊接。
This scheme analyzes the automatic welding technology of pressure pipe and abstracts the reasonable process and can provide reference for site welding of pressure...
该方案将压力钢管自动焊技术分解并提炼出了合理的工艺，可为水电站压力钢管的现场焊接提供参考。
The structure has the advantages of simple and practical use, easy installation and future maintenance, and on-site welding-free property, and rust caused by welding is prevented.
该结构简单实用，易于安装和以后的检修，并且达到现场免焊接的目的，防止由于焊接带来的锈蚀问题。
Furthermore, the paper studied on special construction process about thick slab welding technique, cast steel site-welding technique and cell cantilever assembly without scaffold technique.
在超高层的钢结构施工技术方面，本文则重点研究了现场厚板焊接技术、铸钢节点焊接技术和单元扩大悬臂安装施工技术的原理及技术要点。
Furthermore, the paper studied on special construction process about thick slab welding technique, cast steel site-welding technique and cell cantilever assembly without scaffold technique.
在超高层的钢结构施工技术方面，本文则重点研究了现场厚板焊接技术、铸钢节点焊接技术和单元扩大悬臂安装施工技术的原理及技术要点。
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