Nor-Mar Industries strips trucks to custom fit them with cranes, heavy-duty equipment, storage and other features needed by clients in the forestry, construction, mining and oil sectors. Before delivery to the client, strength and toughness of the welded frames must satisfy safety regulations.
Nor-Mar recently finished a research project with Professor Lukas Bichler of the University of British Columbia to better understand Nor-Mar’s manufacturing procedures and practices, as well as to de-velop protocols to enhance the quality of its welded frames, made of AR200 steel. Welding methods are known to create stresses that must be minimized to prevent inclusions or defects (e.g., fissures, tears or porosity).
The research team accessed the CNBC in August 2013 to non-destructively determine the residual stresses. The project not only provided scientific evidence that Nor-Mar’s welding practices were on track, but also identified areas that could be enhanced at the sample preparation stage.
Subsequently, Nor-Mar modified its welding protocols, which have now been approved by the Cana-dian Welding Bureau for use. As a result, Nor-Mar has successfully implemented the needed changes in order to deliver a premium-quality product to its clients.
Industries that retrofit vehicles operate in a stringent regulatory environment. Thus, it is likely that knowledge of the stress in welded truck frames will continue to be needed as these industries im-prove their practices, develop new products and respond to changes in regulations.