Using scanning electronic microscope, gas hole of flowerpots were studied and analyzed quantitatively and a technical terms, gas hole degree was put forword, on which clustering analysis was based.

Study on pore problem of GAP low-oxygen propellant during curing process;

Analysis and Solution of Pore Defect of WD615 Cylinder Head;

Process Study on Reducing Pore in Production of Solid Composite Propellant;

Weld porosity shortcomings reasons for the formation and Preventive measures;

Prevention and mechanical analysis of porosity formation in pulsed CO_2 laser welding of 30CrMnSiA;

Laser welding of high nitrogen steel 1Cr22Mn16N Ⅰ. Influence of shielding gas composition and heat input on N-content and porosity of weld metal;

Influence of Vacuum Dead-point on Gas Hole for Die Casting;

Formation cause and prevention of gas holes in stainless steel wirerope clamper castings produced by investment casting;

Formation and Prevention of the Gas Holes in Investment Cast Steel Casting;