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Based on ANSYS, a finite elements method study is conducted on couple fields of fixed tube-sheet heat exchanger. On the basis on the calculating results, the paper tries to analyze and evaluate the reliability and parameter sensitivity of the couple field of fixed tube-sheet heat exchanger, so as to present references for the reliable design on the intensity of mechanical equipments.

Intergranular corrosion is a severe damage form of austenitic stainless steel weld joint. Through cognizing the intergranular corrosion mechanism and affecting factors, the related welding technological measures such as small current, fast welding speed, narrow-gap welding, multi-channel welding, and fast cooling are taken in welding and also a good result has been achieved after practical application.

C13H17N3OS, monoclinic, P1̅ (no. 2), a= 7.746(6) Å, b= 12.344(9) Å, c= 12.655(9) Å, α= 95.766(7)°, β= 98.007(7)°, γ= 101.595(13)°, V= 1163.4(15) Å3, Z= 2, Rgt(F) = 0.0550, wRref(F2) = 0.1616, T= 296(2) K.

C16H20N4Ni, monoclinic, P21/n(no. 14), a= 7.6578(10) Å, b= 17.184(2) Å, c= 11.6581(15) Å, β= 100.837(2)°, V= 1506.7(3) Å3, Z= 4, Rgt(F) = 0.0356, wRref(F2) = 0.0945, T= 296(2) K.