1. The flange is mainly welded by submerged arc welding machine. Inner tire wheels are manually welded. The welding wheel shall be free from burr, and check radial runout, end runout, assembly height, appearance and welding seam.
2. Qualified wheels need to continue chemical treatment: first, alkaline washing to remove grease. Next, the surface oxide layer is removed by pickling. Final phosphating primer.
3. Chemical treated wheels are painted on the cathodic electrophoretic paint line and dried into finished products.