Question

welding over oil, grease, dust, dirt, and debris is not a problem for smaw because the flux covering of the electrode cleans the part.

false
true

Explanation:

Analyze the statement

Using the SMAW knowledge point

The statement claims that welding over oil, grease, dust, dirt, and debris is not a problem for SMAW because the flux covering cleans the part.

Evaluate SMAW tolerance to contaminants

While SMAW (Shielded Metal Arc Welding) is more tolerant of light surface rust or mill scale than processes like GTAW, welding directly over oil, grease, dust, dirt, and debris is highly problematic. These contaminants introduce hydrogen, carbon, and other impurities into the weld pool, leading to severe defects such as porosity, cracking, and lack of fusion. The flux covering provides shielding gas, slag, and deoxidizers, but it is not designed to clean heavy organic contaminants or thick debris from the workpiece. Proper joint preparation and cleaning are always required. Therefore, the statement is false.

Answer:

• (A) False (Correct answer)
• (B) True