The increase of weld current can reduce the hardness and the content of upper bainite, and lower the sensibility of hydrogen cracking of the joints.
在避免烧穿的前提下增大焊接电流能够减小硬度、减少上贝氏体，从而降低氢致开裂敏感性。
Disadvantages include risk of hydrogen cracking in carbon steels and weld metal porosity in aluminium alloys.
缺点是在碳钢中有氢致裂纹、铝合金中有焊缝气孔产生的危险。
The principle and operation procedure of the thermal conduction gas chromatography used to measure the diffusion hydrogen in weld metal was expatiated.
阐述了色谱法测定焊接熔敷金属中扩散氢的测试原理及基本操作程序。
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