Millwright Level 1 Practice Exam 2026 - Free Millwright Practice Questions and Study Guide

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What is burnback in gas welding?

Combustion taking place in the mixer

Burnback in gas welding specifically refers to a situation where the flame travels back into the torch or the mixer. This can occur due to a few factors, such as improper adjustment of the gas and oxygen ratios or inadequate gas flow. When burnback happens, it indicates that combustion is taking place where it shouldn't, specifically in the mixer or torch, instead of at the intended welding area. This can not only disrupt the welding process but also pose significant safety hazards to the welder.

Understanding burnback is crucial for ensuring safe and effective welding practices. It emphasizes the importance of torch maintenance and proper setup for optimal welding results.

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Burning of excess filler material

Combustion in the tip causing thick smoke

Heating the workpiece without welding

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