Which type of steels are intended for use in work covered by AWS D1.1?

The focus on low carbon steels as the correct answer stems from the guidelines set forth by AWS D1.1, which is the standard for structural welding of steel. Low carbon steels, also known as mild steels, typically contain less than 0.25% carbon by weight. This composition allows for excellent weldability, ductility, and impact resistance, making them ideal for structural applications.

The lower carbon content minimizes the risk of cracking and ensures that the material can absorb energy without failing, which is crucial for structures that need to withstand dynamic loads and environmental conditions. The use of low carbon steels aligns with the general practices recommended by AWS D1.1 for various welding processes, making them a popular choice in construction and fabrication.

While alloy steels, high carbon steels, and stainless steels can also be used in certain applications, they often require specialized welding techniques and precautions due to their chemical compositions and physical properties. Hence, they may not be covered under the same provisions as low carbon steels in the context of AWS D1.1.