How about EN S355M steel plate weldability

A514 Gr A structural steel plates are mainly used in cranes or large heavy-load machines. ASTM A514 steel offers high strength with weldable, machinable properties.Quenched and tempered for increased strength.Available in eight grades: B, S, H, Q, E, F, A and P.Available in heavy plate thicknesses (3-inches or greater).Suitable in lower temperatures. Charpy impact test results for specific climates available.

The main reference for structural design of steel structure engineering is the static and dynamic characteristics of the steel used under various actions, such as elasticity, plasticity, strength, toughness, fatigue and other mechanical properties. Therefore, the EN S355M steel plate and so on steel used in the construction of steel structure engineering will limit its strength, plasticity, impact toughness and weldability. Steel structure engineering requires high tensile strength and yield point of steel. High yield point can reduce the cross-section of the component, so as to reduce the weight, save steel and reduce the cost. High tensile strength can increase the safety of the structure.

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The addition of Ca element in steel such as EN S355M steel plate can refine grain size, partly desulphurize and change the composition, quantity and morphology of non-metallic inclusions. It is similar to that of adding rare earth in steel. It can improve the corrosion resistance, wear resistance, high temperature and low temperature resistance of steel, improve the impact toughness, fatigue strength, plasticity and welding performance of the steel, and increase the cold heading, shock resistance, hardness and contact endurance strength of the steel.