Abstract: Some examples of the present disclosure relate to welding systems that provide cooling gas flow to contact tips. The contact tip may be retained within a neck and nozzle assembly of a welding torch that receives gas, such as shielding gas, for example, from the welding system. A tip retention-device and gas diffuser may cooperate to retain the contact tip within the neck and nozzle assembly. The gas diffuser may have axial gas channels configured to direct the shielding gas over and/or across a rear portion of the contact tip seated within the gas diffuser. The tip retention device may have gas channels configured to guide gas flow from the gas diffuser over and/or across a forward portion of the contact tip. The gas flow may help to cool the contact tip before, during, and/or after welding, which may extend the life of the contact tip.

Abstract: A tool for both severing the end of a pipe and beveling the cut end includes a spiral cutting mill having an elongate end received in the bore of a frustoconical shell cutter. The shell cutter is locked for rotation with the cutting mill such that a single tool has two cutting surfaces, one for severing a length of pipe and one for beveling the outer edge thereof.

Abstract: A vehicle with devices thereon for exercising the valves of a municipal water system includes a first arm with a valve turning machine at its outer end. A second arm is also attached to the vehicle, the second arm having a torque multiplier head having an input end and an output. A connector connects the valve turning machine to the input and the output of the torque multiplier applies increased torque to the stem of a valve.