AWS Welding Inspection and Testing Certification Practice Test 2025 - Free Welding Certification Practice Questions and Study Guide

Fuel gas fittings are indeed equipped with left-hand threads as a safety measure. This unique threading helps to prevent accidental misconnection with other types of gas fittings, such as those for oxygen, which utilize right-hand threads. By having a distinct threading system, it reduces the risk of dangerous combustion or explosion when working with fuel gases.

This design feature is critical in ensuring that technicians and welders can quickly identify the correct fittings and prevent potentially harmful errors in gas setups. The differentiation in threading serves as a safety protocol in welding and cutting applications. Hence, this response is accurate in affirming the presence of left-hand threads on fuel gas fittings.