How to Avoid Porosity Defects in Flux Cored Wire

The storage environment of Flux Cored Wire directly affects welding quality. It must be stored in a dry, sealed space, keeping the original packaging intact to prevent moisture and oil contamination. Before use, check the condition of the welding wire. If it is found to be damp, it must be re-dried according to specifications to prevent the release of gas from the welding wire into the molten pool during welding. Simultaneously, thoroughly clean the surface of the workpiece to be welded, removing rust, oil, moisture, and other impurities to reduce the source of gas generated by the decomposition of impurities during welding.

Accurately match the welding current, voltage, and welding speed according to the material and thickness of the base metal and the type of Flux Cored Wire. Insufficient welding current will cause the molten pool to cool too quickly, preventing gas from escaping; excessive current may damage the protective gas layer, allowing air intrusion. Reasonably control the arc length to avoid excessively long arcs that could lead to shielding failure, ensuring sufficient time for gas to escape from the molten pool, thus reducing the probability of porosity from a process perspective.

During welding, ensure the purity and stable flow rate of the shielding gas to prevent shielding failure due to impurities or insufficient flow. When welding outdoors or in windy environments, a windproof shelter or windproof device must be erected to prevent air from entering the molten pool. For special welding scenarios such as small-diameter circumferential welds, measures must be taken to prevent flux spillage during Flux Cored Wire welding to ensure the molten pool remains well protected.

Welding operators must undergo professional training and strictly follow operating procedures. Preheat the weld bead before arc initiation. When restarting the arc, grind the weld bead before arc termination before welding to avoid introducing porosity due to improper arc initiation. Maintain a stable electrode speed and angle during welding to prevent the welding wire from leaving the molten pool too quickly when the arc is terminated, reducing the formation of arc craters and porosity. Standardized operation ensures welding quality.