What characteristic indicates a cold weld?

A cold weld is characterized by its rough and irregular edges, which occur when there is insufficient heat applied during the welding process. This inadequate heating prevents the metal surfaces from reaching the necessary temperature to create a proper fusion bond. As a result, instead of forming a strong, continuous joint, the weld exhibits a weak connection with uneven surfaces and a lack of penetration.

In contrast, smooth and uniform edges, as well as even penetration, are typical features of a well-executed weld that has reached the appropriate temperatures and allowed for the materials to meld properly. Similarly, melted base metal indicates that proper heat was applied, facilitating an effective and durable bond between the metals being joined. Therefore, the characteristic of rough and irregular edges is definitive in identifying a cold weld, emphasizing the importance of maintaining correct welding conditions to achieve high-quality results.