S275J2 is a common European standard low-alloy high-strength structural steel with good weldability. Its welding methods mainly include the following, which should be selected according to specific application scenarios, weldment thickness, structural complexity and equipment conditions:

Shielded Metal Arc Welding (SMAW)
Application scenarios: Commonly used in on-site welding, maintenance or small-batch production, suitable for all-position welding (flat, vertical, horizontal, overhead).
Features: Simple equipment, high flexibility, but low production efficiency.
Welding materials:
The electrodes need to match the base metal, and the commonly used E43xx or E50xx series (such as E4303, E5016).
Electrodes need to be dried (usually 350–400°C for 1–2 hours) to remove moisture and prevent pores.
Process points:
For weldments with thickness ≤25mm, preheating is generally not required; when the thickness >25mm, it is recommended to preheat to 100–150°C.
Control the interpass temperature ≤200°C to avoid embrittlement of the heat-affected zone.
Adopt short-arc welding and narrow weld bead technology to reduce heat input.

 

 

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