Question

which one of the following best describes the main difference between oxyfuel cutting (ofc) and weld-ing (ofw)?
a ofc removes metal by oxidizing it; ofw joins metal by melting it.
b ofc joins metal, but ofw oxidizes it.
c ofc and ofw both require electricity to operate.
d ofc uses electricity, and ofw uses gas.

Explanation:

• Option A: Oxyfuel cutting (OFC) works by oxidizing metal to remove it, while oxyfuel welding (OFW) joins metal by melting it. This matches the processes of OFC (cutting/removal via oxidation) and OFW (welding/joining via melting).
• Option B: Incorrectly describes OFC as joining (it cuts) and OFW as oxidizing (it welds by melting, not oxidizing in the same way as OFC's cutting oxidation).
• Option C: Neither OFC nor OFW typically require electricity; they use fuel - oxygen mixtures, so this is wrong.
• Option D: Both OFC and OFW use gas (fuel - oxygen), not electricity for OFC and gas for OFW. So this is incorrect.

Answer:

A. OFC removes metal by oxidizing it; OFW joins metal by melting it.