Spot welding is used to re-polish to avoid scratches by the user, because the lines will appear to be uneven, but it does not affect the functionality.
Spot welding and polishing shall be adopted to avoid scratching by users, because the lines will be uneven, but the functionality will not be affected.
Spot welding is used for polishing to avoid scratching by users, because it looks like the lines will be uneven, but it will not affect the functionality.