Page 53 - SSAB Welding Handbook Edition 2

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Welding handbook 8.0 Fatique in welded joints

8.7 TIG-dressing 60-90°
©SSAB
TIG dressing is the process of melting the weld toe
to smooth the transition between the welded joint
and parent material. This gives a lower stress
concentration, see fig. 8.14.

p=0-2 mm

≈10°
Fig. 8.14: Effects of TIG dressing.

Some inner defects (slag, etc) are also removed with
TIG dressing. TIG dressing also fuses cold laps. TIG
dressing is performed with normal TIG equipment.
For the best results, the electrode should be grinded
prior to use. Fig. 8.15 shows the proper weld Direction of travel
parameters. The voltage is normally between
12-17 V, D.C. Steels from SSAB can be TIG-dressed
without preheating. Fig. 8.16: The recommended angle of the TIG-gun.

Fig. 8.16 gives the angle of the TIG-gun. The gun
should be placed 0.2-1.5 mm in front of the weld
250 toe for optimal results, see fig. 8.16. The process
should start and stop in the weld metal.
Welding current, A 150 Horizontal-vertical The above-mentioned recommendation gives a
200

typical increase in FAT of 30%.
without filler
100
0 40 80 120 160 200 240 280 320
Travel speed, mm/min

Fig. 8.15: Process window for TIG-dressing.

This handbook contains general suggestions and information without any expressed or implied warranty of any kind. SSAB hereby expressly disclaims
all liability of any kind, including any damages, in connection with the use of the information and for their suitability for individual applications. 53
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.