Water nozzle energy storage welding

What was the size of a weld nozzle?

The height and diameter of outer nozzle were 110 and 120 mm respectively, while those of center nozzle were 85 and 40 mm. Below the base metal, the nozzle was the single-layer structure only introducing argon as shielding gas to protect the backside weld pool, whose height and diameter were 60 and 100 mm respectively.

Can a self-designed coaxial nozzle reduce water interference in underwater environment?

Thus, a self-designed coaxial nozzle was employed to minimize water interference in underwater environment, as demonstrated by numerical simulations. Porosity is sensitive to the welding parameters and can be minimized by lowering laser power, increasing velocity, and choosing a modest shielding gas flow rate.

Why do we need a nozzle for ULW?

The protective gas momentum acts as a shielding wall for the water outside the cavity. Therefore, applying such a nozzle for ULW minimizes the shielding effect of the water on the laser and the adverse impact of water on weld formation. Fig. 7.

Can filler wire laser welding be performed on 304 stainless steel?

In this paper, the underwater filler wire laser welding was carried out by the aid of the gas-shielding nozzle for 304 stainless steel, and effects of the process parameters on the welding formation, defects and performance of welded joints were studied.

What is a nozzle used for?

Above the base metal plate, the nozzle was the double-layer structure whose outer layer, introduced into the air to exclude water, and inner layer was used for protecting the molten metal from oxidation and blowing away the plasma through the argon.

How does a coaxial nozzle work?

Firstly, the coaxial nozzle was placed in water environment with a height of 50 mm. Then the shielding gas is supplied to the coaxial nozzle, and the water inside coaxial nozzle is gradually discharged, as shown in Fig. 6 a-f. When time is 0.1 s, there is still a tiny water on the surface of workpiece.