• Leitner, Martin
• Oberwinkler, C.
• Barwart, S.

Abstract

<p>Shredding-tools of crushing-units are mainly used for the recycling of solid waste. They are exposed to enormous local mechanic and abrasive loads. One method to improve the durability is to apply hard facing to the teeth cutting surfaces. Hard faced layers consist of an iron based welding combined with tungsten carbides. These carbide particles should be spread homogenously into the molten ductile iron matrix leading to a ductile and most abrasive resistant filler metal. Hard faced shredding-tools, which are highly resistant to abrasion and impact loads, can be easily manufactured with this particle-based dispersive method. This work focuses on the examination of extensive studies to determine the influence of the filler-material and the hard-tungsten particles to achieve an optimized homogenous welding-process. To investigate weld matrix characteristics, extensive metallographic analysis, macro-hardness measurements and topographical assessments were done. Finally, the optimized weld process was transferred from test plates to industrial chopping teeth with complex geometry.</p>

Topics

• impedance spectroscopy
• surface
• carbide
• hardness
• iron
• durability
• tungsten