MERRLONG mainly produces and sells self-adjusting roller stands, adjustable roller stands, cross-type welding manipulators, turntables, positioners,  custom welding machines, new and used Lincoln submerged arc welding machines and related accessories. These products are widely used in high-end equipment manufacturing fields such as construction machinery, petrochemicals, rail transportation, mining machinery, shipbuilding, aerospace, and defense, as well as other important industries in the national economy.