Described herein is a single-sided welding head including a first welding electrode and a second welding electrode, where the first and second welding electrodes are carried by a body of said welding head. The first welding electrode is movable relative to the body of said welding head at least along a first coordinate of motion. The second welding electrode is movable relative to the body of said welding head at least along a second coordinate of motion; where said first coordinate of motion is a coordinate of angular motion that develops about a first axis of rotation, and said second coordinate of motion is a coordinate of linear motion that develops along a first axis of translation.

An apparatus having a housing, a location pin, a lever and a sensor is disclosed. The housing may be configured to receive a weld head. The location pin may be configured to move linearly in the housing in response to a force between the location pin and a part to be welded. The lever may be rotatably attached to the housing and configured to convert a linear position of the location pin relative to the housing into an angular position of a shaft relative to the housing. The sensor may be coupled to the shaft and configured to generate a value representative of the linear position of the location pin by a measurement of the angular position of the shaft.

An apparatus includes a housing, a pin, a mechanism and a sensor. The housing is configured to receive a weld head. The pin is configured to move linearly relative to said housing. The mechanism is configured to convert a position of said pin into a displacement. The sensor is configured to generate a value representative of said position of said pin based on said displacement.

An apparatus includes a housing, a pin, a mechanism and a sensor. The housing is configured to receive a weld head. The pin is configured to move linearly relative to said housing. The mechanism is configured to convert a position of said pin into a displacement. The sensor is configured to generate a value representative of said position of said pin based on said displacement.

An apparatus includes a housing, a pin, a mechanism and a sensor. The housing is configured to receive a weld head. The pin is configured to move linearly relative to said housing. The mechanism is configured to convert a position of said pin into a displacement. The sensor is configured to generate a value representative of said position of said pin based on said displacement.

Described herein is a single-sided welding head including a first welding electrode and a second welding electrode, where the first and second welding electrodes are carried by a body of said welding head. The first welding electrode is movable relative to the body of said welding head at least along a first coordinate of motion. The second welding electrode is movable relative to the body of said welding head at least along a second coordinate of motion; where said first coordinate of motion is a coordinate of angular motion that develops about a first axis of rotation, and said second coordinate of motion is a coordinate of linear motion that develops along a first axis of translation.

An apparatus includes a housing, a mechanism and a sensor. The housing may be configured to receive a weld head. The mechanism may be attached to the housing and configured to convert a position of a location pin relative to the housing into an angular rotation. The sensor may be coupled to the mechanism and configured to generate a value representative of the position of the location pin based on the angular rotation.

An apparatus includes a housing, a pin, a mechanism and a sensor. The housing is configured to receive a weld head. The pin is configured to move linearly relative to said housing. The mechanism is configured to convert a position of said pin into a displacement. The sensor is configured to generate a value representative of said position of said pin based on said displacement.

An apparatus includes a housing, a pin, a mechanism, and a sensor. The housing is configured to receive a weld head. The pin is configured to move linearly relative to said housing. The mechanism is configured to convert a position of said pin into a displacement. The sensor is configured to generate a value representative of said position of said pin based on said displacement.

An apparatus includes a housing, a lever, a plurality of gears and a sensor. The housing may be configured to receive a weld head. The lever may be rotatably attached to the housing and configured to convert a linear position of a free end of the lever relative to the housing into a first angular position of a first shaft relative to the housing. The gears may be configured to transform the first angular position of the first shaft to a second angular position of a second shaft. The sensor may be coupled to the second shaft and configured to generate a value representative of the linear position of the free end of the lever by a measurement of the second angular position of the second shaft.