The process of fusing one metal to another using combustible gas, covered electrode arcs, and gas-shielded arcs; welding exposes welders to gases, metal fumes, and toxins, and increases risk of lung cancer and mesothelioma
However, joining of dissimilar materials by conventional fusion welding is difficult because of poor weldability arising from different chemical, mechanical, thermal properties of welded materials and formation of hard and brittle intermetallic compounds (IMC) in large scale at weld interface.
Though a wide range of welding processes are now used in manufacturing, say these two Russian civil engineers and specialists in welding and metallurgy, fusion welding is the main technological process.
In the past, fusion welding of large diameter HDPE, or high-density polyethylene, pipe has been practical only for butt splices, according to Neil Sheldon, the general manager at Northern Specialty Supply of Missoula, Mont.
Magnatech Europe supplies innovative systems to both manufacturers and contractors, who require precision welding tools for tasks from simple fusion welding to multipass applications requiring wire feed, torch oscillation and arc voltage control.
Papers from an October 2004 conference highlight advances in joining technologies for both established and emerging engineering materials, covering brazing and microjoining, joining and sealing in fuel cell applications, Pb-free solders, repair of engine components, fusion welding, and practical aspects of joining.