Safety Analysis of Stainless Steel Piping Containing Incomplete Welding Defects under Proportional Loads;

Aiming at the conservation and localization for dividing grade of incomplete welding defect in Regular inspect criterion for in-service industrial pipelines,static strength analysis and safety assessment for plastic failure of localized wall-thinning flaw for root incomplete welding defects scored 4 degree with different ratio of flaw length to pipe circumference L/(πD)=1,0.

Aiming at the conservation and limitation for dividing grade of incomplete welding defects in Regular inspect criterion for in-service industrial pipelines.

?The structure of the ellipse tube with incomplete penetration defects is investigated.

Incomplete penetration defect is one of common defects in industrial pressure piping system, few researches was reported at home and abroad.

Review of research on friction stir welding defects;

Fuzzy assessment of the influence resulted from welding defects on structural fatigue life based on the method of artificial neural network;

Fatigue life prediction for butt welds of 30CrMnSiNi2A steel containing welding defect;

In order to detect weld defects in steel tube,we set up a realtime imaging and detecting system.

The result shows that the ring weld has weld defects and under alternating stress it will crack,which will finally cause breaking of the urea synthetic tower.

Pointing to the circumferential weld of miltilayer warping high pressure vessel had weld defects out of the allowance and cylinder shells on its both sides were loosed.

Processing the aluminum weld image from the scanning of the X ray negative can derive the binary image of the weld defects.