Re: [MW:35677] Welding electrodes

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.

On Tue, 10 Jun 2025 at 20:57, sriram Srinivasan <mail2ram40@gmail.com> wrote:

Hi gentleman 

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

Please guide me 

Regards, Sriram Srinivasan

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