weldingcrayon
nounUK /ˈwɛldɪŋˌkreɪɒn/
US /ˈwɛldɪŋˌkreɪɑːn/
A welding crayon is a special stick of color you use to mark metal before you heat or cut it.
The builder used a welding crayon to draw a line on the steel beam.
OTHER MEANINGS
2. A crayon-like stick that changes color to show how hot metal is.
The welding crayon turned dark when the pipe got hot enough.
3. A colored pencil used by welders to write notes on metal surfaces.
He scribbled the part number with a welding crayon.
4. A tool for drawing guide lines that stay visible during welding.
She marked the cut line with a welding crayon so it wouldn't rub off.