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Re: [MW:36013] Procedure qualification through AWS

By Materials & Welding

Giving below are the hints for WPS (both ISO / AWS) for joining SS 410 (martensite) to SS 316 (austenitic). 

This should be supported by a PQR qualification. 

WPS: Dissimilar Joint: SS 410 vs. SS 316 

1. General Information:

Process: GTAW (Root) + SMAW / GMAW (Fill & Cap); Type: Dissimilar stainless steel welding

2. Base Materials:

SS 410 (UNS S41000) – 410 Martensite SS to  SS 316 – Austenitic SS; ASME sec. IX P no 6 (410) to Pno 8 (316)

3. Joint Details:

Joint Type: Butt joint;  Thickness Range (Qualified): xx mm – xx mm (based on the PQR)

Root Gap: 2–3 mm; Bevel Angle: 60° included; Backing: Optional (SS backing or GTAW root) 

4. Filler Metal:

Primary Choice: ER309L / E309L (for welding);  Alternative (for critical service): ERNiCr-3 (Inconel 82)

GTAW: ER 309L / ER NiCr-3; SMAW: E 309L / ENiCrFe-3; GMAW: ER309L

(309L acts as a buffer to handle dilution & prevent cracking; Ni-base reduces risk of martensite cracking)

5. Welding Parameters: GTAW (root) Polarity: DCEN ; Shielding gas: Argon (99.99%) Flow rate: 10–15 L/min

SMAW (fill/cap).Polarity: DCEP; GMAW (Optional) Mode: Spray / Pulse; Gas: Ar + 2–5% CO₂ or Ar + 2% O₂ 

6.Preheat & Inter-pass Temperature: Preheat  200-300 degC (for SS 410 to avoid cracking); Inter-pass 250 deg.C. 

7. PWHT (for SS 410): SR at 650-700 deg C; Holding time- 1hr / 25 mm thick; Cooling- Controlled furnace cooling. 

8. Special Technique: Buttering recommended on SS 410 side with ER309L to void cracking; Stringer beads preferred (no weaving)

9. Inspection & Testing: 100% VT+ PT + RT / UT – As per the requirement;  Hardness check (important on 410 side & HAZ) 

Trust above details will help you to prepare your WPS & PQR.

 

Sridhar.

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On Tue, 17 Mar 2026 at 15:39, Md Usman Ghani <mdushmanghani@gmail.com> wrote:
Just for clarification
Can any one share, WPS, for ss410 to SS316,

On Mon, 2 Mar, 2026, 12:39 pm Sajeersayed Ali, <sajeersayed@gmail.com> wrote:
5.2.2 Combination of WPSs. A combination of qualified and prequalified WPSs may be used without qualification
of the combination, provided the limitation of essential variables applicable to each process is observed.


On Mon, Mar 2, 2026 at 12:26 PM praba karan <prabakaran776@gmail.com> wrote:
Dear experts,

For procedure qualification as per ASME SEC IX- "Multiple PQRs may support one WPS",

Likewise can we follow the same practice in AWS also?  Because which is not mentioned directly on the code that we can use multiple PQRs to support one WPS.(And I'm not using prequalified WPS)


Thanks & regards
Prabaharan

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