Aimed at key links of tank production process-welding,researched laser cleaning technology before welding,reduced the remainder by surface treatment before welding;researched nearly closed sanding technology for welding at the same time,improved the suction effect of welding leakage sanding,reduced remainder residue. The results show that:there are no aluminum dust and other dust in the laser cleaning process before welding,when the cleaning speed is at 400～600 mm/min,the weld appearance and internal quality is good,and The tensile strength is consistent with the weld joints by manual scraping;nearly closed sanding technology after welding,effectively suck the remainder from welding leakage sanding,no remainder visible to human eye after sanding.