What types of defects can arise from poor welding technique?

• A. Cracks, undercut, porosity, and slag inclusions
• B. Porosity, oxidation, contamination, and warping
• C. Cracks, misalignment, discoloration, and slag removal
• D. Excessive spatter, poor fusion, color mismatch, and contamination

Answer: (A)

The identification of cracks, undercut, porosity, and slag inclusions as defects arising from poor welding technique is based on how these issues stem from inadequate practices or improper settings during the welding process.

Cracks can form when there are rapid cooling rates or residual stresses in the weld area, often exacerbated by improper preheating or cooling practices. Undercut refers to the groove that is formed along the edge of the weld bead, which can weaken the joint and occurs due to excessive heat input or incorrect welding angle, indicating a poor technique.

Porosity results from trapped gas in the weld pool, often linked to inadequate cleaning before welding or improper shielding gas coverage. Slag inclusions occur when the slag produced during welding is not adequately removed before the subsequent passes, again indicative of poor technique or insufficient cleanup practices.

These defects highlight the critical aspects of welding quality control and the importance of skilled techniques, proper equipment settings, and thorough preparation and post-weld cleaning. Understanding these common defects helps to recognize the direct consequences of less-than-perfect welding practices.