WINCOO ENGINEERING CO., LTD. presents the next generation of automated welding solutions for large-scale storage tank fabrication. Our Butt and Corner Welding Machine series is a comprehensive system designed to master both linear butt seams and complex fillet/corner joints on heavy plates.

The lineup features two specialized models engineered for synergy: the MLTW-P/J Submerged Arc Welding (SAW) Tractor and the highly maneuverable WJ-III Swing Fillet Welder. The MLTW-P/J is a mobile, heavy-duty tractor built for high-deposition welding on plates of 6mm thickness and above, handling carbon steel and stainless steel with ease. Complementing it, the WJ-III is a compact, portable device specifically engineered for fillet welds on reinforcement plates, rib plates, and box beams, utilizing an oscillating swing action to achieve ideal weld profiles.

Together, they offer a turnkey solution for everything from tank bottom plates to structural reinforcements.

• Uncompromised Weld Integrity: By eliminating human error, these machines reduce manual welding defect rates (typically ~20%) to nearly zero. The WJ-III's swing technology ensures consistent fusion and avoids common fillet weld flaws, delivering a comprehensive benefit that is nearly 200% higher than manual welding.
• Boosted Efficiency & Labor Savings: Experience a productivity increase of 1.5 times or more compared to manual methods. The WJ-III's ability to produce a wider weld in a single pass reduces the number of required passes, drastically cutting arc-on time and labor costs.
• Simplified Operation for Any Skill Level: The intuitive controls and automated features like the magnetic handle and auto-stop switch mean that even unskilled workers can perform high-quality welding after minimal training, alleviating the pressure of skilled labor shortages.
• Built for Harsh Industrial Environments: Featuring a durable metal construction (as opposed to fragile plastic), the equipment ensures long-lasting durability. The perforated ventilation design in the control systems prevents overheating during continuous 24/7 operation.
• Rapid On-Site Setup: The compact size of the WJ-III (240×330×310 mm, 12 kg) and the mobile design of the MLTW-P/J (90 kg) allow for effortless transportation and setup in confined spaces or remote job sites.

• Large Vertical Storage Tanks: Ideal for welding shell plates, bottom annular plates (MLTW-P/J), and complex corner joints for reinforcement plates and roof attachments (WJ-III) in the oil, gas, and petrochemical sectors.
• Heavy Steel Structures: Perfect for fabricating box beams, H-beams, and welding rib plates for bridges, high-rise buildings, and industrial plants.
• Shipbuilding & Locomotive Manufacturing: Suited for critical fillet welds on ribs, bulkheads, and cross-parts where structural integrity is non-negotiable.
• Water Treatment Infrastructure: Reliable fabrication of large-diameter water reservoirs and clarifiers where weld longevity prevents future maintenance disasters.