Welding electrodes

[sriram Srinivasan]

Hi gentleman 

What is electrode need to use welding EN100025 S355 and rail 71 mn 

Please guide me 

Regards, Sriram Srinivasan

[Parminder Singh]

Use E7018-1

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[sridhar cn]

S355 is a medium-strength structural steel, and think the rail has  0.4–0.8% Carbon. The 70mm thick rail requires preheating to 250–300°C to 

reduce thermal stresses and prevent hydrogen cracking. Post-weld heat treatment (PWHT) may also be needed depending on the rail grade.

E7018 (3.2mm or 4.0mm) is suitable as the first choice. Alternatively, consider E8018-C1 for better toughness and it has better compatibility

compared to E 7018 due to its Nickel  addition . 

C Sridhar.

[Anish R Kurup]

When welding EN 10025 S355 steel (a structural steel) and rail steel (e.g., R260 or similar grades like 71 Mn)

With Regards
Anish R Kurup

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[sridhar cn]

By oversight it was mentioned as 70 mm thick. Please read it as 71Mn steel. Regret the error.

thanks,

C S.

[sridhar cn]

S355 is a structural steel grade with a minimum yield strength of 355 Mpa and has 1.0–1.6% Mn. R260 is a rail steel grade with a 

tensile strength of 700–900 Mpa, 0.6–0.8% C and 0.8–1.3% Mn. It is prone to martensitic formation during welding due to its higher 

Carbon content. Carbon Equivalent (CE) for R260 is 0.8–1.0 and for S355, 0.4–0.5.

 

E7018-1 (AWS A5.1) with a 1.0–1.6% Mn suits R260 which has a higher Mn. Alternatively, E8018-G or E10018-D2 provide enhanced 

strength and toughness. Preheat R 260 to 200–250°C and possibly PWHT (600-650⁰C) may be required depending on its thickness 

and critical applications. Ensure proper joint design to manage stress. Qualify a procedure as per relevant codes. 

C Sridhar.

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