Using the finite element method software Dynaform,numerical simulations of blank holder force are carried out to reseach its influence on the strain path of the dangerous point and the weld line movement on the condition of different BHF.

The weld line movement was one of the important factors for the formability of TWBs.

The conclusions show that different tendencies of weld-line movement occur in different .

Based on finite element simulation software Dynaform,the influence of process parameters such as blank holder force,liquid pressure and its loading paths on the weld-line movement in hydro-forming deep drawing of TWBs with different thickness was simulated and investigated.

The investigations include mechanism of TWBs′ springback,influence of distribution of BHF on TWBs′ springback and the relation between TWBs′ springback and welded-line movement.

Fracture and welded-line movement are two main problems in stamping of multi-gauge laser tailor-welded blanks.

For tailor-welded blanks(TWBs) square box,adopted the self-made hydrostatic press and the square box mould with split binder,the forming strain path,the welded-line movement and the forming limit depth were analyzed by the numerical simulation and the stamping experiment with various technological parameters.