To address a leaking heating boiler, first disconnect power and drain the system to eliminate pressure and moisture. Clean the affected area using a wire brush or grinding wheel to remove rust, scale, and debris. Select a welding rod matching the boiler’s material (e.g., 1.6mm E6013 for carbon steel). Use a stick welding technique, maintaining a 10-15 degree angle and steady travel speed. Fill the gap completely, overlapping焊缝 to ensure structural integrity. Post-weld, allow the boiler to cool naturally and inspect for cracks or porosity. Reassemble and test under low pressure before full operation.

The process prioritizes safety and material compatibility to prevent catastrophic failures. The National Fire Protection Association (NFPA) reports that 15% of boiler-related fires stem from improper repairs, often due to inadequate surface preparation or incorrect welding rods. A 2021 study in Welding Journal found that 30% of failed boiler welds involved insufficient cleaning, leading to hydrogen embrittlement. The American Welding Society (AWS) mandates AWS D1.1 standards for fabrication, emphasizing post-weld heat treatment for materials over 0.5 inches thick. Neglecting these steps increases repair costs by 40-60%, as noted by the U.S. Department of Energy, due to recurring leaks and energy losses. Proactive maintenance reduces boiler downtime by 25%, per a 2020 HVAC efficiency report, underscoring the economic and safety benefits of expert welding practices.