The fixtures might be automated with pneumatic clamping. Or the fixtures may use manual clamping for effective part holding. For larger work pieces, hydraulic welding fixtures may be needed to handle the load the part exerts on the tooling. Manual welding fixtures are designed to help the human welder and produce more reliable results in the production welding process.
Manual Clamping Fixtures are designed with manual hand clamps. These fixtures can be used in manual welding or robotic welding setups. They rely more on the operator to properly position parts than required for a pneumatic or hydraulic welding fixture. Manual clamping is usually used to reduce costs of tooling implementation and eliminate the need for electrical or pneumatic/hydraulic buildout for a fixture.