Abstract
The aim of the research presented in this article is analysis of the effect of the surface treatment method on the static and fatigue strength of flash butt welded bandsaw blades. A 1-mm-thick 75Cr1 cold-work tool steel sheet used for bandsaw blades was used as the test material. Fractographic studies of the fatigue fractures and fractures formed in static tests were also carried out. The static strength tests showed sandblasting the weld surface had no significant effect on the load capacity of the joint. However, the sandblasted specimens showed a higher repeatability of the load capacity (lower standard deviation). In the case of both analyzed sample variants of specimens, sandblasted and non-sandblasted, the number of cycles at which the sample was damaged decreases with the percentage increase of the stress amplitude. When loading the samples with a stress amplitude value in the range between 400 and 690 MPa, sandblasting of the weld surface increased the average value of destructive cycles by about 10–86% (depending on the stress amplitude) compared to non-sandblasted joints. The sandblasting process introduces compressive stresses in the surface layer of the welds, therefore the variable tensile load acting on the sample requires a greater number of cycles before the fatigue cracks initiate and propagate. In the case of all specimens, a ductile fracture was observed. It was also found that, regardless of the variable stress amplitude, sandblasting has a positive effect on reducing the standard deviation of fatigue test results.
Highlights
The aim of the research presented in this article is analysis of the effect of the surface treatment method on the static and fatigue strength of flash butt welded bandsaw blades
The purpose of this work is to analyze the effect of sandblasting the flash butt weld surface on the static and fatigue strength properties of the joints made of 75Cr1 steel, which is commonly used for bandsaw blades
The static strength tests of the sandblasted sheets did not show any significant influence of this type of treatment on the joint load capacity
Summary
The aim of the research presented in this article is analysis of the effect of the surface treatment method on the static and fatigue strength of flash butt welded bandsaw blades. The static strength tests showed sandblasting the weld surface had no significant effect on the load capacity of the joint. The sandblasting process introduces compressive stresses in the surface layer of the welds, the variable tensile load acting on the sample requires a greater number of cycles before the fatigue cracks initiate and propagate. It was found that, regardless of the variable stress amplitude, sandblasting has a positive effect on reducing the standard deviation of fatigue test results. In the production of shields from thin sheets, the use of resistance welding is much cheaper than, for example, the use of fusion welding [4] It is a similar situation in the automotive industry, where the use of welded joints is more economic, and often used for complex shape components
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