氢是钛及钛合金的主要有害元素之一。钛及钛合金焊接时,氢是产生气孔的重要因素之一。许多金属包括钛及钛合金在内,都存在氢脆问题。焊接接头的氢脆敏感性更大,这是因为焊接接头氢的含量局部超过基体金属,加之存在焊接残余应力、焊接缺陷、晶粒粗大、接头塑性低等问题。1967年美国 Hydrogen is one of the main harmful elements of titanium and titanium alloys. When titanium and titanium alloys are welded, hydrogen is one of the most important contributors to porosity. Many metals, including titanium and titanium alloys, contain hydrogen embrittlement. Hydrogen embrittlement of the welded joint is more sensitive because the content of hydrogen in the welded joint exceeds the amount of the base metal partially, and there are problems such as welding residual stress, welding defects, coarse grains and low plasticity of the joint. 1967 United States