Welder Red Seal · Question
A welding procedure calls for preheating a specific carbon steel component to 200 °C. What is the most effective method for measuring and ensuring this temperature is maintained during welding?
Temperature-indicating crayons (Tempilstik) are a very common and effective method for accurately indicating if a specific preheat or interpass temperature has
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Question: A welding procedure calls for preheating a specific carbon steel component to 200 °C. What is the most effective method for measuring and ensuring this temperature is maintained during welding?
Answer options:
- Using a digital thermometer with a surface probe
- Observing the colour change of the heated metal ✅ Applying temperature-indicating crayons to the workpiece
- Using an infra-red temperature gun from a distance
Correct answer: Applying temperature-indicating crayons to the workpiece
Explanation: Temperature-indicating crayons (Tempilstik) are a very common and effective method for accurately indicating if a specific preheat or interpass temperature has been reached and maintained on a workpiece. While digital thermometers can be used, crayons provide a visual indication directly on the surface being welded. Colour change is subjective and unreliable, and infrared guns can be affected by emissivity.
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Question explanations
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