MFE 201 Lecture Notes - Lecture 8: Refractory Metals, Leg Before Wicket, Tungsten
31 Mar 2016
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Document Summary
In electron beam welding (ebw) a high energy beam of electrons is generated and magnetically focused on the workpiece to be joined. In order to prevent the electrons from being slowed down or dispersed by air atoms the process is carried o in a vacuum. This process is used to weld high purity and high melting temperature materials that are di cult to weld by other methods. The vacuum ensures no contamination of the weld, and the energy intensity of the electron beam is su ucient to melt refractory metals such as tungsten. The process is autogenous and requires machining of the joint to ensure very tight matching of surfaces. Notice the very thick sections possible in only one pass. Also note the high depth to width ratio attained by this method. These features are possible due to the high intensity of the process. This also allows for minimal heat input, and thus very small haz.
