ER80S-B2 TIG / GTAW filler metal is a chrome-moly filler option used for compatible 1.25Cr-0.5Mo low-alloy steels. Treat it as a starting point for selection, not as automatic approval to weld. Before ordering rod or setting up a repair, verify the WPS, base metal grade, service conditions, and the manufacturer data sheet.
The Weld Support Parts filler metal finder page and product page are useful for narrowing the search, but they do not replace code review or procedure qualification. If the joint is in pressure service, elevated temperature service, or an application with postweld heat treatment requirements, confirm every step against the governing specification.
Key Takeaways
- ER80S-B2 is a TIG / GTAW filler metal classification under AWS A5.28.
- It is associated with 1.25Cr-0.5Mo chrome-moly steels.
- Use it only when the WPS and base metal call for it or allow it.
- Do not assume compatibility with P11 or B2-type material without verification.
- Rod size, shielding gas, heat input limits, and PWHT requirements are job-specific. Unknown (Verify).
How to Use the Filler Metal Finder Page
Start with the Weld Support Parts filler metal finder to narrow the alloy family and process. The finder is a selection tool, not a procedure approval tool. Use it to identify likely matches, then verify the final choice against the WPS and the manufacturer data sheet.
Check: whether the base metal family is chrome-moly and whether the process is TIG / GTAW.
Inspect: the joint specification for required filler classification, preheat, interpass limits, and postweld heat treatment.
Verify: that the selected rod matches the applicable code, the service conditions, and the exact base material designation.
ER80S-B2 Selection Notes
The ER80S-B2 product page at Weld Support Parts can be used for general reference: ER80S-B2 TIG / GTAW Filler Metal. The page description indicates a chrome-moly TIG rod for compatible B2 / P11-type alloys. That wording should be treated as a starting point only.
When reviewing a job for ER80S-B2, confirm the following:
- Base metal grade and product form.
- Service temperature range and exposure conditions.
- Required mechanical properties after welding and any PWHT.
- Whether the code allows this classification for the joint.
- Whether the manufacturer offers the rod in the diameter required for the setup. Unknown (Verify).
If the drawing or WPS is missing, stop and obtain it before welding. If the base metal stamp is incomplete, do not guess. Positive material identification or documentation may be required. Unknown (Verify).
Troubleshooting and Support Checks
Use the following checks when a job calls for ER80S-B2 or a similar chrome-moly TIG rod.
Problem: filler metal classification on the paperwork does not match the part in stock.
- Check: the rod box label and heat number against the purchase record.
- Inspect: whether the code or WPS allows a substitution.
- Verify: with welding engineering or the customer before issuing rod.
Problem: the base metal is described only as “chrome-moly.”
- Check: the exact grade, specification, and material traceability.
- Inspect: whether the joint is on a pressure part, tube, pipe, or plate.
- Verify: the exact alloy family before selecting ER80S-B2.
Problem: the job requires heat treatment or high-temperature service.
- Check: the WPS for preheat, interpass, and PWHT instructions.
- Inspect: whether the service conditions alter filler selection.
- Verify: the filler metal against the governing code and manufacturer literature.
Problem: cracking, lack of fusion, or inconsistent bead appearance.
- Check: travel speed, amperage, tungsten condition, and shielding gas coverage.
- Inspect: cleanliness, fit-up, and root preparation.
- Verify: that the technique matches the procedure. Equipment settings may be job-specific. Unknown (Verify).
Practical Pre-Order Review
Before placing an order for ER80S-B2 TIG / GTAW filler metal, run a short review:
- Confirm the exact AWS classification listed on the WPS.
- Confirm the base metal specification and thickness range.
- Confirm whether TIG / GTAW is the approved process.
- Confirm diameter requirements. Common diameters may exist, but the correct size for your job is Unknown (Verify).
- Confirm packaging quantity and storage requirements from the supplier page or data sheet.
This review prevents stock errors. It also reduces the chance of issuing a low-alloy rod for a joint that actually needs a different classification such as ER90S-B3 or another approved filler. Do not substitute without authorization.
Safety Notes
- Follow the WPS, not assumptions based on alloy family alone.
- Use appropriate PPE for GTAW, hot metal handling, and cylinder safety.
- Do not weld on unidentified alloy pipe or pressure parts without verification.
- Observe preheat and interpass controls if required by the procedure.
- Use ventilation and fume control appropriate to the task and work area.
If the job involves pressure equipment, critical service, or life-cycle performance concerns, escalate to welding engineering or the responsible code authority before welding.
FAQ
Is ER80S-B2 automatically correct for P11 material?
No. Treat that as a possibility only. Verify the exact base metal grade, the WPS, and the applicable code before using it.
Can I use the filler metal finder as final approval?
No. The filler metal finder is a selection starting point. It helps narrow options, but it does not approve procedure compliance.
What rod diameter should I order?
Unknown (Verify). Diameter depends on joint design, amperage range, operator preference, and the WPS.
Does ER80S-B2 cover every chrome-moly repair?
No. Chrome-moly is a broad description. Confirm the actual alloy and service conditions before selection.
Sources Checked
Review the product page and finder page together, then confirm the WPS and material documentation before purchase or welding.
Disclosure: As an Amazon Associate, Weld Support Parts may earn from qualifying purchases.
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