PVC welding wire welding requires strict control of temperature, cleanliness, and operating procedures. Key considerations include pre-welding preparation, welding process control, and post-welding maintenance. Pre-welding preparation: Clean the workpiece area to be welded, removing oil, dust, and oxide layers. Lightly sand the surface with sandpaper to increase roughness and ensure a tight weld fit. Check that the PVC welding wire specifications match the workpiece material, and ensure the welding rod is free from defects such as moisture, deformation, or cracking. Adjust the welding equipment temperature according to the welding rod type (200-250℃ for hot air guns, 260-300℃ for extrusion welding machines), and conduct a trial weld beforehand to confirm the temperature is suitable. Welding process control: Maintain a stable welding temperature, avoiding excessively high temperatures that could cause PVC decomposition and the generation of harmful gases, or excessively low temperatures that could lead to incomplete melting. During welding, maintain the angle between the welding rod and the workpiece at 30-45 degrees, advancing at a uniform speed to ensure the welding rod completely melts and fills the weld seam, without air bubbles or voids. Use a moderate airflow rate when using hot air welding to avoid excessive heat affecting the welding effect. Apply uniform pressure during extrusion welding to ensure the molten material fully fuses with the workpiece.
Post-welding curing: After welding, avoid touching the joint immediately; allow it to cool and solidify naturally for at least 30 minutes. During cooling, avoid stress or vibration on the workpiece to prevent joint deformation. Inspect the welded joint for cracks and leaks; if defects are found, repair welding promptly. Furthermore, welding should be performed in a well-ventilated environment, and protective masks and gloves should be worn to avoid inhaling harmful gases and burns.
