Flexible Rail Arc Welding Machine Tank All Position Construction Machinery Welder The WINCOO WHI-Ⅲ (WHL-Ⅲ) Flexible Rail Arc Welding Machine is a portable, high-precision automatic welding system specially designed for all-position welding of large storage tanks, pressure vessels, pipelines and steel structures. With its innovative flexible rail design, this welding tractor can follow straight, curved and circular seams freely, perfectly solving the problem of on-site all