1.Ten years experience of welding manufacture 2.Approved EN ISO 3834-3, DIN EN ISO 3834-3, ISO9001:2008 3.Benz's supplier welding frame seat-back for train AL-0071 Specification:according to drawins and samples Meterial: Steel, stainless steel, carbon steel, aluminum, zinc, brass, plastic etc. Making process: Stamping, deep drawing, bending, punching, threading, welding , tapping, riveting, ...