What are the characteristics of a good weld?

A good weld is characterized by several key factors that contribute to its overall quality and effectiveness in a welding application. These characteristics include good appearance, which means that the weld should have a smooth and uniform surface without any unsightly defects. Full penetration indicates that the weld has fully fused the base materials together, ensuring a strong bond throughout the thickness of the weld. Proper width is essential because it signifies that the weld is not too narrow or excessively wide, as either condition could compromise the joint's strength. Lastly, the absence of defects, such as cracks, porosity, or slag inclusions, is crucial as these flaws can weaken the weld and lead to failure during service.

In contrast, the other options provide characteristics that are either detrimental to weld quality or irrelevant. Bright color and quick cooling do not necessarily indicate a good weld, as they can vary due to material types and welding processes. Rough edges and uneven thickness suggest poor craftsmanship, which would undermine the integrity of the weld. Similarly, a circular shape and lots of sparks indicate an improper welding technique or process, which may weaken the joint rather than strengthen it. Hence, the selected option accurately reflects the essential features that define a high-quality weld.