It has good impact flexibility and crack resistance at low temperature and arc stability in operation . Its operational performances meet the requirements in both vertical down and all - position welding .

它具有 熔 敷 金属 扩散氢含量小于50ml/100g、 焊缝低温冲击韧性和抗裂性优良、施焊时电弧稳定、操作工艺性能符合要求、既能进行 立 向 下行 焊接、又能作全位置 施 焊等 特点。

In this paper the improvement of vertical down welding in piping is introduced and the technology of mixed vertical downwards welding and co-operated vertical down welding are described .

介绍了手工 向下焊 焊接 工艺在长输管道焊接方面的发展，主要叙述了混合型向下焊焊接工艺和复合型向下焊焊接工艺的应用。

Application of vertical down welding for gas pipe line

天然气长输管道 下 向 焊接技术的应用

Research on Low Cellulose Type Covered Electrode for All Position and Vertical Down Welding

低纤维素型全位置 立 向下 焊条的研究

Vertical down co_2 welding for fin tubes of boiler

锅炉鳍片管的CO2 向下 立 焊

The results showed that operative performance in the vertical down welding can be improved through fine droplet increasing chemical reactive heat in arc area raising arc blow force .

指出细化熔滴、增加电弧的化学反应热、加入在500℃以上 分解 气体的物质可有效提高电弧吹力进而改善 立 向下 焊接操作性。

The cold cracking sensibility of high tensile pipeline-steel was studied by Ygroove cracking test using seven kinds of high cellulose electrode of vertical down position welding .

采用七种高纤维素型 立 向下 电焊条，通过斜Y坡口裂纹实验，对高强管线钢的冷裂敏感性进行实验研究。