Welder (Red Seal)

Performs common occupational skills

Before each shift, a hand grinder's guard should be inspected primarily to confirm it does what?

1. Deflects sparks and contains a wheel if it shatters
2. Increases the rotational speed of the abrasive wheel
3. Reduces the amperage drawn by the grinder motor
4. Improves the surface finish left by the abrasive

A grinder guard deflects sparks and contains fragments if the wheel shatters, so a cracked or removed guard is unsafe. It does not raise wheel speed, change motor amperage, or improve finish quality. On the job, the welder checks the guard each shift and replaces it before use if it is loose, bent, or missing, because an abrasive wheel can shatter at full speed and throw fragments at the operator and nearby workers.

RSOS 2023 | A-1.01 Maintains hand, power, layout and measuring tools

Performs layout and fabrication of components for welding

When assembling a weldment, the term fit-up refers primarily to what?

1. Painting and applying the final finish coat to the whole assembly after welding
2. Aligning and securing parts to the correct dimensions before welding
3. Selecting the final surface colour of the finished welded product
4. Recording the labour hours spent on the welding project

Fit-up is the alignment and securing of parts to the correct dimensions before welding. It is not the painting step, a colour choice, or a time-recording activity. Good fit-up sets up everything that follows, so the welder verifies alignment, gap, and root face against the drawing before tacking; correcting fit-up after tacking means grinding out the tacks and starting over.

RSOS 2023 | B-8.03 Assembles components

Performs cutting and gouging

In oxy-fuel cutting of steel, the high-pressure oxygen stream cuts by doing what?

1. Rapidly oxidizing the preheated steel and blowing it away
2. Melting the steel along the kerf purely by electrical-resistance heating
3. Chilling the steel below its transition point until it fractures cleanly
4. Dissolving the steel in the kerf with a strong chemical solvent stream

Oxy-fuel cutting works by oxidizing preheated steel and blowing the oxide slag out of the kerf. It is not an electrical-resistance, freezing, or chemical-solvent process. Because oxy-fuel cutting depends on a chemical reaction with the heated steel, it works on carbon steel but struggles on metals that form stubborn oxides; the welder selects plasma or another process for those materials.

RSOS 2023 | C-10.01 Selects OFC gas and equipment