Oxy–acetylene welding fundamentals Select the approximate maximum flame temperature achievable with an oxy-acetylene torch under ideal conditions.

Introduction / Context:
Gas welding depends on flame temperature and chemistry. Knowing the approximate maximum flame temperature of oxy–acetylene helps in selecting processes, nozzles, and travel speeds for brazing, welding, and cutting operations.

Given Data / Assumptions:

• Neutral oxy–acetylene flame with proper oxygen-to-acetylene ratio.
• Ideal mixing and standard atmospheric pressure conditions.
• Workpiece preheat or heat sink effects ignored for temperature rating.

Concept / Approach:
The inner cone of a neutral oxy–acetylene flame reaches about 3100–3200°C, sufficient to weld steels and many nonferrous alloys, and to braze at lower temperatures. Other fuel–oxygen combinations (e.g., oxy-hydrogen) possess different flame temperatures and characteristics.

Step-by-Step Solution:
Identify flame type: neutral oxy–acetylene.Recall typical max flame temperature ≈ 3200°C at the inner cone.Select the closest option 3200°C.

Verification / Alternative check:
Manufacturer charts for welding tips list flame temp near 3200°C; practical weld pool behavior on steel corroborates this capability.

Why Other Options Are Wrong:
1800–2400°C undervalue the well-known capability of oxy–acetylene; 3800°C overstates typical achievable temperature for this fuel pair.

Common Pitfalls:
Confusing workpiece temperature with flame temperature; misadjusting torch to oxidising or carburising, altering effective heating.

Final Answer:
3200°C