A device used for mechanically holding and conducting current to an electrode during welding or cutting. See Figure D-5.
An electrode holder is it clamping device which allows the welder to hold and control the electrode. It also serves as a device for conducting the welding current from the welding cable to the electrode. An insulated handle on the holder separates the welder’s hand from the welding circuit. The current is transferred to the electrode through the jaws of the holder. To assure minimum contact resistance and to avoid overheating
of the holder, the jaws must be kept in good condition. Overheating of the holder not only makes it uncomfortable for the welder, but also it can cause excessive voltage drop in the welding circuit. Either can impair the welder’s performance and reduce the quality of the
weld.
The holder must grip the electrode securely and hold it in position with good electrical contact. Installation of the electrode and removal of the expended electrode stub must be quick and easy. The holder needs to be light in weight and easy to handle, yet it
must be sturdy enough to withstand rough use. Most holders have insulating material around the jaws to prevent grounding of the jaws to the work.
Electrode holders are produced in sizes to accommodate a range of standard electrode diameters. Each size of holder is designed to carry the current required for the largest diameter electrode that it will hold. The smallest size holder that can be used without overheating is the best one for the job. It will be the lightest, and it will provide the best operator comfort.
The electrode holder must be kept clean to ensure maximum operating life. Clean jaws and contact points maintain good electrical connection and consequently less heating and buining of the holder. The insulation must be kept tight and in good repair. If the jaws are closed by a spring, the electrode holder should be inspected to see that the spring is in good order at all times. Under extreme heat, springs sometimes lose temper and must be replaced. A weak spring slows up welding and reduces the quality of the
weld.