Also in this paper,weldability and possible weld defects in TC4 titanium alloy are analyzed,and the path and the steps on preventing weld defects are put forward,as quality is controlled in every phase such as preparing before welding,trimming,processing penetration depth experiments and welding,etc.

In order to improve detection precision, the method of detecting T-type fillet weld lack of penetration height was discussed using ramp probe in the wing.

The tensile experimental results of four group L 3R welding test specimen included defect free and with above plate part,defect free and no above plate part,with lack of penetration and above plate part,with lack of penetration and no above plate part were presented in this work.

The lack of penetration (LOP) is a very common type of discontinuities in welds,so that how to simplify it more scientifically and reasonable and therefore to conduct its fracture analysis are a problem continuously interested to engineering and academic circles.

Ultrasonic detecting method of incomplete penetration depth of T-joint weld;

Effects of incomplete penetration on the stress concentration of lattice frame empty spheric joint;

However, the researches into the pipe tees with incomplete penetration defects are inadequate.

This article concisely introduces the region and range of full penetration welding in XJ23-1 FPSO hull based on BV rules.