Which instrument is used to specifically measure undercut depth on a weld?

Which instrument is used to specifically measure undercut depth on a weld?

• A. Cam Gauge
• B. Dial Gauge
• C. Micrometer
• D. Vernier Caliper

Answer: (A)

Undercut depth refers to how far the base metal has been burned away below the weld toe along the edge. To read this accurately you need a tool designed to fit into the groove and translate that depth into a readable value. A cam gauge is built for this purpose; its cam profile engages the undercut and provides a direct depth reading on a scale, giving a quick and repeatable measurement of how deep the undercut is. Other instruments are more general-purpose: a dial gauge measures small displacements but isn’t specialized for groove depth; a micrometer measures thickness or small dimensions with limited reach; a vernier caliper can measure external or internal dimensions and has a depth feature, but it isn’t as efficient or precise for evaluating weld undercut depth.

Undercut depth refers to how far the base metal has been burned away below the weld toe along the edge. To read this accurately you need a tool designed to fit into the groove and translate that depth into a readable value. A cam gauge is built for this purpose; its cam profile engages the undercut and provides a direct depth reading on a scale, giving a quick and repeatable measurement of how deep the undercut is. Other instruments are more general-purpose: a dial gauge measures small displacements but isn’t specialized for groove depth; a micrometer measures thickness or small dimensions with limited reach; a vernier caliper can measure external or internal dimensions and has a depth feature, but it isn’t as efficient or precise for evaluating weld undercut depth.