Century 117-050 100 wire feed welder Parts

For the Century 117-050 wire-feed welder, use .030 in MIG wire for thin steel and cleaner control, and .035 in MIG wire when you need more fill and penetration on thicker steel. In most home-shop repairs, .030 in is the easiest to tune and least likely to burn through.

Quick pick guide (by metal thickness)

• Up to about 1/8 in steel: choose .030 in for smoother starts and better puddle control
• Around 1/8 in and thicker: choose .035 in if your machine can run it consistently
• Auto body and sheet metal: .030 in (or smaller if your setup supports it)
• Gaps, rusty edges, fit-up issues: .030 in helps you “stitch” and avoid overheating
• Long fillets on thicker brackets: .035 in can build faster when heat is available

What changes when you switch wire size

What you care about	.030 in wire	.035 in wire
Arc control on thin metal	Better	Harder to keep cool
Deposition rate (how fast it fills)	Lower	Higher
Burn-through risk on thin steel	Lower	Higher
Typical drive-roll/liner sensitivity	More forgiving	Slightly less forgiving

Setup checklist (so the wire actually feeds right)

• Match the drive roll groove to the wire diameter (.030 or .035)
• Use the correct contact tip size for the wire
• Keep the liner clean and the gun cable as straight as possible
• Set wire speed first, then fine-tune voltage/heat with test beads
• If the arc stubs or surges, check for a worn tip, dirty wire, or too much drive-roll tension

Why it matters

Wire diameter changes how much metal you push into the weld puddle and how much heat you need to melt it smoothly. On a compact wire-feed welder like the Century 117-050, choosing the right wire size makes dialing in settings faster and reduces spatter, burn-through, and weak cold-lap welds.

Parts and help

If you are shopping for consumables or replacement items for your Century 117-050, start with the model parts list, or search by model number on Sears PartsDirect.

Last updated: February 2026

ER70S-6 is an AWS classification for a solid mild-steel filler wire commonly used for MIG (GMAW) welding with shielding gas, including on a Century 117-050 wire feed welder. It tells you the filler type, strength class, and chemistry: ER (electrode/rod classification), 70 (70 ksi tensile class), S (solid wire), and 6 (higher deoxidizers).

What each part of ER70S-6 means

• ER: Filler metal classification that indicates it can be used as an electrode (continuous wire in MIG/GMAW) or as a rod (cut lengths in some processes); it does not mean it is a stick (SMAW) electrode.
• 70: Tensile strength class of the deposited weld metal (about 70,000 PSI, or 70 ksi)
• S: Solid wire (not flux-cored)
• 6: Chemistry with more silicon and manganese deoxidizers than some other ER70S wires

Why the “-6” chemistry matters

ER70S-6 is popular because the added deoxidizers help the weld puddle tolerate light oxidation and mill scale better than lower-deoxidizer wires.

Typical benefits:

• Smoother bead appearance
• More stable arc on mild steel
• Reduced sensitivity to light surface scale (good prep still matters)

Quick comparison (common shop guidance)

Wire classification	Best use case	Notes
ER70S-6	Mild steel with mill scale or slightly oxidized surface	Still clean and degrease for best results
ER70S-3	Cleaner, new steel	Less forgiving on scale and oxidation

Setup checks that affect results

• Use the correct shielding gas for solid wire (solid wire requires gas)
• Confirm polarity for MIG with solid wire (commonly DCEP)
• If you see porosity, check for drafts, leaks, and gas flow before changing wire

Why it matters

Matching wire classification to your material condition helps you get consistent bead quality and strength from your Century 117-050, and it can reduce spatter and rework.

For parts and model lookups, search your Century 117-050 on Sears PartsDirect.

Last updated: February 2026

The model number is usually on the welder’s rating label (data plate). On the Century 117-050 wire feed welder, check the outside cabinet near the power cord entry, the rear panel, or inside the side cover; match what you find to the format shown in [how to find your appliance model number (and what it means for parts)].

Where to look on a Century wire feed welder

Check these common label locations first:

• Rear panel near the input power cord or strain relief
• Side panel near the wire spool compartment door
• Inside the side cover (unplug first, then remove the cover screws)
• Bottom of the cabinet or base frame
• Near the cooling vents or fan opening

What the label should show

Most rating labels include several identifiers. Use the model number for parts lookup.

Label item	What it means	What to use for parts
Model number	The exact product version	Use this (example: 117-050)
Serial number	Unique unit identifier	Not used to search parts
Input rating	Voltage/amps/phase	Helpful for troubleshooting
Output rating	Welding output range	Helpful for setup

Tips to avoid mix-ups

• Write the model number exactly as printed, including dashes (117-050).
• If you see multiple numbers, choose the one labeled MODEL.
• If the label is worn, take a clear photo with angled lighting to make faint text readable.

Why it matters

Century welders can have similar cabinets but different internal components (wire feed parts, switches, transformer, and wiring). Using the exact model number helps us match the correct diagrams and replacement parts.

Last updated: March 2026