Possible Applications of Welding and Soldering Techniques for Special Metals

摘要

Elements such as titanium, zirconium, vanadium, niobium, tantalum, molybdenum, tungsten, beryllium, and their alloys are regarded as special metals and, because of their unusual physical, chemical and mechanical properties, are becoming increasingly important in modern technology. Both welding and soldering techniques are used to form closed joints with these materials. However, problems which can impair the mechanical, chemical and physical properties occur due to the usually high affinity of these elements towards oxygen, nitrogen and hydrogen, because of toxicity (beryllium) and because of the extremely high melting points (tungsten, niobium, tantalum, molybdenum) and the resulting high working temperatures. The most important techniques suitable for obtaining functional welded and soldered joints with special metals are reported.