Abstract
Butt welding of commercially pure titanium Grade 1 and Ti6Al4V alloy sheets using a pulsed Nd:YAG laser KLS 246 - 102 LASAG were carried out to determine optimal values of pulse energy and pulse length to create completely penetrated weld. Surface peak power density of about 3.105 W.cm−2 was found as an optimal value. Weld dimensions, both face width and penetration depth, are found to be proportional to increasing energy and decreasing pulse length. Gentle sagging and root penetration were revealed by means of contact surface profilometry. The nanohardness tests on transverse cross-sections detected approximately 50% higher hardness in the fusion zone than in the base material.
Highlights
The commercially pure titanium (CP Ti) and its alloys especially Ti6Al4V have good weldability
Average values of weld face fusion zone width (FZW) and root width (RW) together with fusion zone penetration depth (FZPD) of not fully penetrated welds are summarized in Table 1 for CP titanium samples, welded with constant pulse length of 3 ms and increasing pulse energy
Measurement of Ti6Al4V alloy samples welded with constant pulse energy of 5.03 J and increasing pulse length denoted the same trend
Summary
The commercially pure titanium (CP Ti) and its alloys especially Ti6Al4V have good weldability. Influence of laser beam parameters (power, pulse energy and frequency, scanning speed, spot diameter, focus position and shielding gas influence) on weld bead properties were examined in research laboratories all over the world. Badgar et al investigated effect of heat input during welding of CP titanium by means of CW Nd:YAG laser on microstructure, microhardness, relative elongation, tensile and yield strength in Ref. Lisiecki presented results of the disk laser welding of titanium alloy Ti6Al4V likewise in Ref. Fomin et al added filler to Ti6Al4V butt welds welded by means of 8 kW continuous-wave ytterbium fiber laser IPG and study influence of post welding heat treatment on microstructure, microhardness, residual stress distribution and fatigue performance A significant influence of the laser welding high cooling rates to result weld mechanical properties was pointed out
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