How are Fasteners Tested for Hardness?
What process is used to check the hardness of fasteners?
A. Casting
B. Forming
C. Heat treatment
D. Quality control
When is a fastener rejected during hardness testing?
A. Less than 20 Brinell
B. Less than 30 Brinell
C. Less than 40 Brinell
Answer:
The hardness of fasteners is checked during the quality control phase.
Explanation:
Fasteners undergo several production stages, one of which is hardness testing. During this phase, the hardness of the fasteners is checked using a Brinell hardness test. If a fastener has a Brinell hardness of less than 30, it is rejected as it does not meet the required standard.
The damage to the inspected parts likely occurs during the hardness testing phase, as this process involves applying force to the surface of the fastener using a hardened steel ball or diamond indenter, which can cause damage.
Therefore, The inspected parts are likely to be damaged during hardness testing, as it involves applying force to the part's surface.
Fasteners are typically made using a process that involves several stages such as casting, forming, heat treatment, surface cleaning, and quality control. During the quality control phase, the hardness of the fasteners is checked using a Brinell hardness test.
The hardness test involves pressing a hardened steel ball or diamond indenter into the surface of the fastener and measuring the impression left. This test helps ensure that the fasteners meet the required hardness standards for their intended use.
If a fastener has a hardness reading of less than 30 Brinell, it indicates that the fastener is too soft and may not be able to withstand the intended load or pressures. As a result, it is rejected during quality control to prevent any potential failures in the application.
Hardness testing is a critical part of the fastener manufacturing process to guarantee the quality and reliability of the fasteners in various industrial applications.