Two-way stainless steel welding
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Dear friends: Is welding duplex stainless steel difficult? What methods and equipment are best for welding?
It is a duplex stainless steel; ordinary duplex steels such as 2205 are easy to weld, while super duplex steels are slightly more difficult to weld.
When welding duplex stainless steel, it is crucial to control the welding heat input properly; this value should generally be no less than 5 KJ/cm, but it should also not exceed 12–15 KJ/cm. The reason duplex steel is called such is that a balance between ferrite and austenite needs to be maintained, which is why the welding heat input is so important. A higher heat input is required for the root pass of welding, as cooling too quickly can lead to cracks. Additionally, preheating or post-weld heating is not necessary when welding duplex steel. During welding, it is advisable to use narrow weld beads and carry out multiple passes, using a lower heat input compared to that required for ordinary stainless steel.