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This circumferential welder is specially designed for pipe and flange welding, ideal for joining the inner and outer ring seams of double-end pipe flanges. It supports various materials including carbon steel, low alloy steel, and stainless steel. Equipped with an automatic arc length tracking system (AVC) and a welding torch oscillation system (OSC), this circumferential welder ensures stable welding performance, smooth seams, and excellent consistency during pipe and flange welding operations.