PSI - Issue 38

Tuomas Skriko et al. / Procedia Structural Integrity 38 (2022) 393–400 Skriko et al. / Structural Integrity Procedia 00 (2021) 000 – 000

396

4

position (PB) was applied. Furthermore, the starting and ending point areas of welding and laser dressing were removed after manufacturing phase in order to have constant and uniform joint region for the fatigue tests.

660 280

clamp

clamp

40

100

200

150

200

20

7.8

7.8

Fig. 1. Shape and dimensions of the fatigue test specimens along with the sequence and directions of the welding and laser dressing runs.

Table 3. Welding and laser dressing parameters of non-load-carrying fillet-welded cruciform joints. Process Position I U v wire v travel θ travel θ tilt CTWD P

Q

[A]

[V]

[m/min] [mm/s] [°]

[°] 45 64

[mm]

[kW]

[kJ/mm]

GMAW

PB

225 - 233 28.3 - 28.6 13.2

5.9 8.3

18 a

22

6.4 - 6.6 0.76 - 0.79 b

Laser dressing PB

-

-

-

0

-

2.0

0.22

a Forehand technique (push) b Considered the electrical cable resistance of the robot welding equipment

In order to achieve high quality laser-dressed weld toe with sufficient geometry, various parameter setups were tested. The performed laser dressing experiments showed that using either too high power or too high travel speed caused undercuts and unformed toe geometry and thus, inadequate quality. However, appropriate results, which can be seen in Fig. 2b, were attained with laser dressing parameters presented in Table 3.

(a)

(b)

Fig. 2. Fillet weld joint in (a) as-welded and (b) laser-dressed condition.