4 AWG Welding Cable Class K 600V Cable

• Medium-duty welding applications
• On-site construction welding
• Field repairs
• Mobile welding services

 Both are 600V copper welding cables; the difference is stranding. Class K uses 30 AWG strands and an EPDM jacket that resists heat, abrasion, and moisture. It’s the standard choice for welding leads, temporary power, and shop work, at a lower cost per foot. Class M uses finer 34 AWG strands and a CPE jacket, so it bends, coils, and routes more easily. Choose Class K for durability and value, and Class M when leads move constantly or run through tight spaces.

Match the filler wire to your metal thickness and machine. As a rough guide: .023"–.024" for thin sheet and auto body work; .030" for light fabrication up to about 1/4"; .035" for general shop, trailer, and structural work from 1/8" to 1/2"; and .045" or larger for heavy plate on machines above 300A. Use solid wire with shielding gas indoors and flux-cored wire outdoors or on thick, rusty steel. Welding cable is sized separately, by your machine’s maximum amperage and the total length of the electrode and ground leads.

• Size the cable to your welder’s max output and total lead length; undersized leads overheat.
• Turn off the welder before connecting or swapping leads.
• Inspect jackets every shift and replace damaged sections instead of taping them.
• Keep lugs and connectors tight; loose ones overheat.
• Clamp the ground on clean metal close to the weld.
• Fully uncoil leads before welding.
• Keep leads out of water and away from sharp edges, hot slag, and traffic.
• Never wrap leads around your body.

 4 AWG welding cable is widely used for battery cables in cars, boats, and golf carts, winch power leads, inverter connections in RV and small solar setups, and temporary power hookups for portable equipment. Check local code before using welding cable for permanent building wiring.