Product Description Custom welding fabrication gantry structure steel construction CSM Group can provide professional Welding and Machining OEM service for Metal Structures as customers' drawing. Material: as customers' requirement, compliance with ASTM, DIN, BS, JIS, NF, ISO etc. standard Workmanship: cutting + welding + machining + heat treatment + surface finishing Welding standard: AWS NDT: UT, MT and PT (in-house and the third party inspection)