Question

melting a metallic filler which flows across the joint and cools to form a solid bond
mechanical device which allows gas to flow in only one direction
colorless gas widely used as a fuel and a chemical building block
flame which burns at a low temperature and can add extra carbon to welds because the flame contains more acetylene than oxygen
:: check valve
:: cutting torch
:: carburizing flame
:: acetylene
brazing

Explanation:

Match each term to its definition based on welding/metalworking terminology:

1. Brazing: Defined by melting a filler metal (not the base metal) to form a bond.
2. Check Valve: A mechanical one-way gas flow device.
3. Acetylene: A colorless fuel/chemical building block gas.
4. Carburizing Flame: A low-temperature flame with excess acetylene that adds carbon to welds.

Answer:

• Brazing → melting a metallic filler which flows across the joint and cools to form a solid bond
• Check Valve → mechanical device which allows gas to flow in only one direction
• Acetylene → colorless gas widely used as a fuel and a chemical building block
• Carburizing Flame → flame which burns at a low temperature and can add extra carbon to welds because the flame contains more acetylene than oxygen