Impeller Welding
Impellers are the heart of turbocompressors which are used in the petrochemical, oil & gas industries. The highest pressure and most efficient designs incorporate an integral hub and cover. One of the more complex electron beam welding operations is the joining of the cover to impeller blades on 5-axis milled impellers. The weld is accomplished by welding through the cover into the center axis of each blade, which requires a precise 5-axis move while simultaneously sloping the welding parameters. To avoid forming a stress riser and potential crevice corrosion site PTR worked with Dresser-Rand to develop the EBrazeTM process, a combination EB weld and braze joint. The heat of the weld melts the braze material forming a cover to blade bond along 100% of the interface. (EBrazeTM is a trade mark of Dresser-Rand)
Description:
Impeller Body with
Integral Machined Blades
and Cover- Up to 3 ft.
diameter
Material(s):
High Strength Steel
Joint Geometry:
blind EBraze™ T-weld
Weld Depth:
0.300 in.