WPS for EN material.

[Shrivastav Saumey]

Dear All,

Greetings of the day....

I have a project and am working on EN standard material.It is my first time for EN material.

The two types of material are given below:

1)EN 1.4401

2)EN 1.5415

Welding materials categories:

1)EN 1.4401 + EN 1.4401

2)EN 1.4401 + EN 1.5415

3)EN 1.5415 + EN 1.5415

May you please guide the WPS for this material,Bevel face,electrode characteristics and which specification/standard will be used?

Thanks & Regards

Saumey shrivastav

 

[Bhavani Prasad Emani]

Hi Srivastav,

For your first EN material project, here's a comprehensive WPS guide for EN 1.4401 (316 stainless steel) and EN 1.5415 (16Mo3 creep-resisting steel):

Material Identification

Property	EN 1.4401	EN 1.5415
UNS/ASTM Equivalent	S31600 / ASTM 316	- / ASME SA-209 T1
Material Type	Austenitic stainless steel (Cr-Ni-Mo)	Low-alloy creep-resisting steel (0.5% Mo)
Key Element	2-2.5% Mo for corrosion resistance	~0.5% Mo for high-temperature strength
Melting Point	~1400°C	~1510°C

Applicable Standards for WPS

Standard	Purpose
EN ISO 15614-1	WPS qualification for metallic materials (arc welding)
EN ISO 9606-1	Welder qualification
EN ISO 3581-A	Stainless steel covered electrodes (for 1.4401)
EN ISO 3580-A	Low-alloy steel covered electrodes (for 1.5415)
AWS A5.4	Stainless steel electrodes (alternative)
AWS A5.5	Low-alloy steel electrodes (alternative)
EN ISO 15613	WPS qualification by pre-production test weld

Welding Consumables (Electrode/Filler Selection)

1. EN 1.4401 + EN 1.4401 (Stainless-to-Stainless)

Process	Electrode/Filler	Classification
SMAW (Stick)	E316-16 / E316L-16	EN ISO 3581-A: E 19 12 3 B 2 2
GTAW (TIG)	ER316 / ER316L	AWS A5.9: ER316/ER316L
GMAW (MIG)	ER316S / ER316LSi	Matching composition

Electrode characteristics: Basic or rutile coating, low carbon (L) version preferred for thick sections to prevent sensitization

2. EN 1.5415 + EN 1.5415 (16Mo3-to-16Mo3)

Process	Electrode/Filler	Classification
SMAW	E7018-A1 / E8018-B2	EN ISO 3580-A: E Mo B 42 H5
GTAW	ER70S-6 / ER80S-B2	AWS A5.18: ER70S-6
GMAW	ER80S-B2	Matching 0.5% Mo composition

Electrode characteristics: Basic coating, low-hydrogen, DC+ polarity, preheat 100-150°C required

3. EN 1.4401 + EN 1.5415 (Dissimilar Steel)

Process	Electrode/Filler	Classification
SMAW	E309L-16 or ENiCrFe-7	EN ISO 3581-A: E 23 12 3 B 2 2
GTAW	ER309L or ERNiCrFe-7	AWS A5.9: ER309L

Electrode characteristics: Use austenitic filler (309L) to accommodate CTE mismatch and prevent cracking; nickel-based filler for critical high-temp service

Bevel Preparation (Joint Design)

Thickness	Bevel Angle	Root Face	Root Gap	Groove Type
≤ 3 mm	Square butt (0°)	0-0.5 mm	0-1 mm	Square
3-10 mm	30-35° (single V)	1-2 mm	1-3 mm	Single V
10-20 mm	35-40° (single V)	1.5-2.5 mm	2-3 mm	Single V
> 20 mm	37.5° (double V)	2-3 mm	2-4 mm	Double V

General bevel guidelines:

• Stainless steel (1.4401): 35-45° total included angle, clean burr-free edges

• Low-alloy steel (1.5415): 30-37.5°, mechanical grinding preferred

• Dissimilar: Same as thicker material, ensure clean oxide-free edges

Preheat & Interpass Temperature

Material Combination	Preheat	Interpass Max	PWHT Required
1.4401 + 1.4401	Not required (unless thick section >25mm)	150°C	No (unless corrosive service)
1.5415 + 1.5415	100-150°C	250°C	Yes (620-650°C, 1hr/inch)
1.4401 + 1.5415	100-150°C (for 1.5415 side)	150°C	Yes (stress relief at 620°C)

Key WPS Parameters Summary

For 1.4401 (Stainless):

• No preheat for most thicknesses

• Low heat input to prevent carbide precipitation (max 1.0 kJ/mm for critical corrosion service)

• Back purging with argon for root pass (oxygen-free)

• Post-weld: Pickling/passivation for corrosion resistance

For 1.5415 (16Mo3):

• Preheat 100-150°C mandatory

• Heat input: 0.5-2.5 kJ/mm

• PWHT mandatory: 620-650°C for creep service

• Low-hydrogen consumables only

For Dissimilar (1.4401+1.5415):

• Use 309L or nickel-based filler to manage CTE difference

• Preheat 100-150°C (controlled for stainless side)

• Minimize heat input to stainless side to prevent sensitization

• Stress relief PWHT at 620°C (compromise temperature)

Recommended WPS Document Structure

Your WPS should reference:

1. Base materials: EN 10088-2 (1.4401), EN 10216-2 (1.5415)

2. Welding process: EN ISO 4064 (SMAW=111, GTAW=141, GMAW=135)

3. Consumable standard: EN ISO 3581-A or EN ISO 3580-A

4. Qualification standard: EN ISO 15614-1

5. NDE requirements: EN ISO 17635 (visual, RT, UT, PT as applicable)

Since this is your first EN material project, I recommend working with a certified welding engineer to finalize the WPS with actual trial welds and destructive testing per EN ISO 15614-1 requirements.

Thanking you,

With best regards,                                            

           

Bhavani Prasad Emani,
Mob.No: +91 9032585485

     

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