$9.$ Seam welding is a variation of spot welding where the electrodes are replaced with rotating wheels, making it ideal for creating long, continuous welds in $\_\_\_$ manufacturing. $($True$/$False$)$

$10.$ Resistance butt welding and flash butt welding both utilize the principle of applying electrical current and pressure to join ends of materials, but flash butt welding involves the additional step of $\_\_\_$ the material ends before joining. $($True$/$False$)$