采用碱性药皮焊条和焊前接头预热的施焊方法，焊接的空间管道接头热应力小。
For overhead pipeline, welding with basic-compound coated electrodes and pre-welding heating of the joint will reduce the joint thermal -stress.
研究了碱性焊条工艺性的影响因素，探讨了焊缝金属的含氢量、焊条药皮的吸湿性、焊缝金属的强韧化特性等。
The influence factors such as the hydrogen content in weld metal, the hydroscopicity in electrode coating and the toughness of weld metal of basic electrodes are studied.
在碱性铁粉焊条药皮中添加不同量的纳米稀土氧化物粉体，对焊缝进行扩散氢含量、低温冲击及化学成分的测试和分析。
Adding the different nanometer CeO2 content to alkali iron powder electrode, the diffusible hydrogen content, low-temperature impact and chemical composition of the weld were tested.
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