Combined Weld Defect
A combined weld defect consists of the simultaneous presence of various irregularities such as pores and slag inclusions at the same location in a weld. This leads to a more severe quality assessment.
Physical-Chemical Mechanism of Action
A combined weld defect occurs when multiple irregularities occur simultaneously during the welding process. For example, pores can form due to insufficient deoxidation, and slag inclusions due to incomplete removal of impurities.
Metallurgical Relevance & Risks in Welding
A combined weld defect can lead to significant quality issues. Porosity cannot withstand mechanical loads well and can cause cracks or deformation. Slag inclusions can significantly impair the weld strength, which can lead to fractures especially under high load conditions.
Workshop Practice & Instructions
To avoid combined weld defects, it is crucial to perform careful weld preparation. This includes a clean surface of the material, proper deoxidation, and removal of all impurities. Additionally, welding parameters such as temperature and time should be precisely followed. If a combined defect is suspected, the weld should be thoroughly inspected and, if necessary, rewelded.