ОСОБЛИВОСТІ ЛАЗЕРНО-ПЛАЗМОВОГО ЗВАРЮВАННЯ КОРОЗІЙНОСТІЙКОЇ СТАЛІ AISI 304 З ВИКОРИСТАННЯМ ЛАЗЕРА.

The paper confirms the presence of synergic effect at laser-plasma welding, using fiber laser, by comparing the cross-sectional areas of beads deposited in AISI 304 plate (δ = 4 мм) by laser, plasma, and hybrid processes at close power values of laser radiation and plasma arc (~2 kW each). It is determined that the manifestation of this effect depends on welding speed. At the speed of 2 m/min the hybrid bead cross-sectional area can exceed the sum of areas produced with the laser and plasma processes by up to 30%, and for the speed of 4 m/min by ~20 %. Comparison of input energy of the laser and hybrid processes of stainless steel welding showed that the difference between them depends on the welded sheet thickness (or penetration depth). This value first decreases from ~100 % for sheets with δ = 2 mm to 50 % for sheets with δ = 6 mm, and at further increase of penetration depth it rises to 60 %. The nature of dependencies of the factor of area ratio φ, weld geometry К and penetration depth Ф on the speed of hybrid welding of AISI 304 steel allows recommending the range of speeds of 1.5…2.0 m/min, as a more acceptable by the criteria of synergic effect and penetration depth. It is found that at hybrid welding with application of fiber laser radiation, the plasma component promotes elimination of such defects of weld upper bead formation, characteristic for laser welding, as undercuts and a ridge, etc. [ABSTRACT FROM AUTHOR]