Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is preparing to weld two pieces of 6 mm thick mild steel together using SMAW. Before welding, they need to clean the joint surfaces. What is the primary reason for thoroughly cleaning the metal before welding?
Thoroughly cleaning the metal before welding is crucial to prevent contamination from rust, paint, oil, or grease, which can lead to porosity, lack of fusion, c
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Question: A technician is preparing to weld two pieces of 6 mm thick mild steel together using SMAW. Before welding, they need to clean the joint surfaces. What is the primary reason for thoroughly cleaning the metal before welding?
Answer options: ✅ To prevent weld contamination and ensure proper fusion
- To make the weld easier to grind and finish
- To improve the aesthetic appearance of the weld bead
- To reduce the amount of filler metal required
Correct answer: To prevent weld contamination and ensure proper fusion
Explanation: Thoroughly cleaning the metal before welding is crucial to prevent contamination from rust, paint, oil, or grease, which can lead to porosity, lack of fusion, cracking, and other weld defects. Proper cleaning ensures a sound, strong weld. While it might indirectly affect finishing or appearance, the primary reason is always weld integrity.
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