Weld Support Parts Blog

Tag: solid wire

  • ER70S-6 MIG / GMAW Filler Metal: Filler Metal Finder Notes

    ER70S-6 MIG / GMAW Filler Metal: Filler Metal Finder Notes

    ER70S-6 MIG / GMAW Filler Metal

    ER70S-6 MIG / GMAW filler metal is a common starting point for mild steel and carbon steel fabrication, repair, and general shop work. It is widely used because it supports routine production welding and maintenance work where good fit-up, practical deposition, and broad application matter. That said, the filler wire is only one part of the weld package. Final selection still depends on the WPS, base metal, service condition, joint design, shielding gas, and any code or customer requirements.

    Use the WSP filler metal page and the filler metal finder as selection references, not as automatic procedure approval. The product page for ER70S-6 MIG / GMAW Filler Metal and the filler metal finder are starting points for narrowing the choice. They do not replace a qualified WPS or manufacturer data sheet.

    Key Takeaways

    • ER70S-6 is a general-purpose solid wire for MIG / GMAW on mild steel and carbon steel.
    • Do not treat a filler metal listing as proof of WPS compliance.
    • Verify base metal grade, thickness, service environment, and shielding gas before ordering wire.
    • Match wire diameter to the application and the procedure. Common sizes may include .023 in, .030 in, .035 in, and .045 in, but the correct size is procedure-dependent and may be Unknown (Verify).
    • For critical work, confirm code requirements and manufacturer data sheets before welding.

    How to Use ER70S-6 as a Starting Point

    ER70S-6 is often selected when the job calls for a dependable solid wire for shop fabrication, repair work, and general maintenance on carbon steel. It is often considered alongside ER70S-3 and ER70S-2 during selection, but the right choice depends on cleaning level, deposition needs, and the procedure in use. Do not assume a wire works because it is common. Check the actual base metal and the weld requirement first.

    Check: the base material identification, thickness, and any drawing notes.
    Inspect: the joint condition, contamination, rust, mill scale, primer, and moisture.
    Verify: the WPS, shielding gas, polarity, and wire diameter before loading the feeder.

    Troubleshooting and Support Checks

    If the arc is unstable, the weld bead profile is inconsistent, or spatter is higher than expected, do not assume the wire is wrong. Start with the setup and consumable path.

    Check the gun liner, contact tip, drive roll tension, and wire feed path for drag or birdnesting risk.
    Inspect the shielding gas delivery, flow settings, leaks, and nozzle condition.
    Verify the wire diameter matches the drive roll groove, contact tip, and procedure requirements.

    If porosity appears, the first checks should be gas coverage, surface contamination, and stickout. If there is excessive spatter, review voltage, wire feed speed, inductance if available, and whether the wire is being used within the intended procedure. If fusion is poor, verify travel speed, work angle, joint prep, and heat input settings. These are support checks, not guaranteed fixes. Unknown (Verify) details should be confirmed against the WPS and the manufacturer data sheet.

    Filler Metal Finder Notes

    The filler metal finder is useful when the team is sorting through options for mild steel and carbon steel work. Treat it as a filtering tool. Start with the process, classification, and base metal family, then narrow by job requirement. The finder can help reduce guesswork, but it cannot approve a weld procedure.

    Use these practical selection questions:

    • Is the job MIG / GMAW and solid wire is allowed by the WPS?
    • Is the base metal mild steel or carbon steel?
    • Does the service condition require a different filler or higher control?
    • What diameter is called out, or what size is permitted by the procedure?
    • Is the shielding gas specified, or is it Unknown (Verify)?

    If any answer is unclear, stop and verify before purchase. A common wire selection can still be wrong for the application if the service environment, code, or procedure is not matched.

    Ordering and Setup Checklist

    Before you order or load ER70S-6 wire, run this basic check sequence:

    • Check the WPS number and revision.
    • Inspect the base metal marking, mill certs, or job traveler if available.
    • Verify that the shielding gas, polarity, and wire diameter are compatible with the procedure.
    • Check spool size and feeder capacity for the job volume.
    • Inspect storage conditions to reduce moisture and contamination risk.

    If the documentation is incomplete, the technical answer is not to guess. Mark the missing data as Unknown (Verify) and confirm it through the welder, supervisor, engineer, or manufacturer data sheet.

    Safety Notes

    Welding safety still applies when using a standard mild-steel solid wire. Keep the work area ventilated, protect against arc radiation, and control fumes generated by base metal, coatings, and contamination. Remove flammables from the weld area and use correct PPE. Verify local procedures for hot work, cylinder handling, and shop ventilation. If the job involves coated, painted, plated, or dirty steel, the fume and cleanup risk may be higher than expected.

    FAQ

    Is ER70S-6 a universal choice for all MIG welding?
    No. It is a common starting point for mild steel and carbon steel, but the final choice depends on the WPS, base metal, service conditions, and code requirements.

    Can I use the filler metal page as proof of procedure approval?
    No. The filler metal page is a selection reference only. Confirm the WPS and manufacturer data before welding.

    What wire diameter should I buy?
    Use the diameter listed by the procedure or job requirement. Common sizes may include .023 in, .030 in, .035 in, and .045 in, but the correct size for a given job may be Unknown (Verify) until the WPS is checked.

    What should I verify before troubleshooting weld defects?
    Verify gas delivery, base metal condition, contact tip condition, wire feed path, polarity, and the weld settings before assuming the filler wire is the root cause.

    Sources Checked

    Final note: use the product page and the finder as support tools, then verify the job requirements before ordering or welding. When in doubt, stop and confirm the WPS, base metal, and manufacturer data sheet.

    Disclosure: As an Amazon Associate, Weld Support Parts may earn from qualifying purchases.

  • ER70S-3 MIG / GMAW Filler Metal: Filler Metal Finder Notes

    ER70S-3 MIG / GMAW Filler Metal: Filler Metal Finder Notes

    ER70S-3 MIG / GMAW Filler Metal

    ER70S-3 MIG / GMAW filler metal is a general-purpose solid wire used on clean carbon steel fabrication. It is typically treated as a starting point for selection, not a final approval for production welding. Before ordering wire or loading a feeder, verify the WPS, code requirements, base metal grade, joint condition, shielding gas, and the manufacturer data sheet.

    Key Takeaways

    • ER70S-3 is a solid MIG/GMAW wire for clean mild steel and carbon steel.
    • Use it as a selection starting point, not as proof of WPS compliance.
    • Lower deoxidizer content means surface condition matters more.
    • Confirm wire diameter, shielding gas, and procedure limits before welding.
    • If the joint has rust, mill scale, or contamination, verify whether a different wire or cleaning method is required.

    What to Check Before You Order

    For ER70S-3, the key question is not just whether the wire matches the material family. It is whether the job condition matches the wire’s intended use. This wire is presented on the WSP filler metal page as a general-purpose option for clean carbon steel fabrication. That means fit-up, cleaning, and procedure control matter.

    Inspect: Base metal type, surface contamination, joint prep, and required weld procedure. Check whether the job uses carbon steel that is clean enough for a general-purpose solid wire. Review the applicable code or spec if the job is code-controlled.

    Verify: The WPS, wire classification, shielding gas, polarity, and diameter. The source page lists ER70S-3 under AWS A5.18, but the job still needs procedure-level verification. If any detail is unclear, record it as Unknown (Verify) rather than assuming it will work.

    Check: The filler metal page and the filler metal finder page together as selection tools. Use them to narrow choices, then confirm with the manufacturer data sheet and internal welding requirements before purchase.

    Troubleshooting Support

    If weld quality is inconsistent, do not start by changing only parameters. Start by checking the basics.

    Issue: Excess spatter or unstable arc

    • Check: Shielding gas setup, stickout, contact tip condition, and drive roll tension.
    • Inspect: Wire feed path for drag, liner wear, and contamination.
    • Verify: That the wire diameter matches the feeder setup and procedure. Unknown (Verify) if the feeder has been reconfigured since the last job.

    Issue: Porosity

    • Check: Base metal cleanliness, gas coverage, and leaks in hoses or fittings.
    • Inspect: Rust, oil, moisture, paint, or mill scale on the joint.
    • Verify: Whether the material condition is suitable for ER70S-3 or if the procedure calls for different cleaning or filler selection.

    Issue: Poor wetting or inconsistent bead shape

    • Check: Voltage, wire feed speed, travel speed, and torch angle.
    • Inspect: Joint gap and part fit-up.
    • Verify: That the welding parameters align with the approved WPS. Do not assume a setting that worked on one job is valid for another.

    Filler Metal Finder Notes

    The WSP filler metal finder page is useful when you need to narrow a wire choice from process and base metal information. It should be treated as a selection starting point only. It does not replace the WPS or manufacturer data sheet.

    Use the finder page to confirm the wire family for MIG / GMAW applications and then compare it against the job requirements. For ER70S-3, the practical question is whether the base metal is clean enough and whether the procedure allows this general-purpose wire. If the service condition is critical, high restraint, or code governed, verify all requirements before release to production.

    ER70S-3 MIG / GMAW filler metal page

    WSP filler metal finder

    How to Use This Wire Correctly

    ER70S-3 is generally used on clean carbon steel where a solid wire is appropriate. The practical checks are simple, but they need to be done in order.

    1. Check the job requirements. Confirm the WPS, material grade, and service conditions.
    2. Inspect the joint. Remove oil, moisture, and loose contamination. Unknown (Verify) if surface cleanliness is acceptable without further prep.
    3. Verify the machine setup. Confirm polarity, drive rolls, liner, tip size, and shielding gas.
    4. Run a test weld. Evaluate bead shape, fusion, and spatter before production welding.
    5. Document results. If the weld is intended for a controlled job, keep the settings and observations with the job record.

    Safety Notes

    • Use proper ventilation or local exhaust when welding.
    • Wear the required eye, hand, and body protection for MIG welding.
    • Keep shielding gas cylinders secured and fittings leak-checked.
    • Do not weld without verifying the base material and procedure requirements.
    • If the metal condition is unknown, stop and verify before proceeding.

    FAQ

    Is ER70S-3 a general-purpose MIG wire?
    Yes, it is presented as a general-purpose solid MIG/GMAW wire for clean carbon steel fabrication. That does not mean it is approved for every job. Verify the WPS and base metal first.

    Can I use ER70S-3 on rusty or dirty steel?
    Not as a default assumption. Lower deoxidizer content means the joint condition matters more. Inspect the surface and verify whether additional cleaning or a different filler is required.

    Does the WSP page replace the manufacturer data sheet?
    No. Use the WSP page and the filler metal finder as selection tools only. Verify the final choice with the manufacturer data sheet and the project requirements.

    What should I verify before buying wire?
    Check the classification, diameter, shielding gas requirement, WPS, base material, and service conditions. If any item is unclear, mark it as Unknown (Verify).

    Sources Checked

    This draft is intended for welders, fabricators, maintenance buyers, and welding support teams who need a practical starting point for filler metal selection. Final responsibility for procedure compliance remains with the user and the governing welding documentation.

    Disclosure: As an Amazon Associate, Weld Support Parts may earn from qualifying purchases.

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