Main characteristics of Austenitic stainless steel.
1) Thermal conductivity only between one third and one half that of other steels.
2) Coefficient of thermal expansion by 30-40%, even 50% greater
can any one explain the above two points.plzz
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what v do is what v are..mechanical engineers
What is there to explain? these are the properties of the material. However as far as the subject welding is concerned, look here.
The very high coefficient of expansion associated with this material means that welding distortion can be quite savage. I have seen thick ring flanges on pressure vessel twist after welding to such an extent that a fluid seal is impossible. Thermal stress is another major problem associated with stainless steel; premature failure can occur on pressure plant heated by a jacket or coils attached to a cold veesel. This material has poor thermal conductivity, therefore lower welding current is required (typically 25% less than carbon steel) and narrower joint preparations can be tolerated. All common welding processes can be used successfully, however high deposition rates associated with SAW could cause solidification cracking and possibly sensitisation, unless adequate precautions are taken.
welding
Re: welding
