3
VLBS-U-LT
The weld-on material must be suitable for welding
and the contact areas must be free from impurities,
oil, colour, etc. The material of the forged welding
block is: S355J2 (1.0577), DIN EN 10025-2
• The lifting points must be positioned on the load in
such a way that movement is avoided during lifting:
• For single leg lifts:
the load ring should be
positioned vertically above the centre of gravity
of the load.
• For two leg lifts:
the lifting points must be
equidistant to/or above the centre of gravity
of the load.
• For three and four leg lifts:
the lifting points
should be arranged symmetrically around the
centre of gravity in the same plane, if possible.
• Load Symmetry:
Determine the working load limit of each individual
RUD lifting point for symmetrical and unsymme-
trical loading according to the following physical
formula:
W
LL
= working load limit / single strand (kg)
G
= Weight of load (kg)
n = Number of load bearing strands
ß
= Inclination angle of single strand
W
LL
=
G
n x cos ß
Number of load bearing strands:
Symmetrical
Unsymmetrical
two leg
2
1
three / four leg
3
1
Table 1: Load bearing strands (see table 3)
• Finally check correct assembly (see section
4
Inspection / repair / disposal
).
3.3 Hints for the welding
The welding should only be carried out according to
ISO 9606-1 or AWS Standards by an authorized welder.
Verifications of suitability of the used weld-on mate
-
rial must be checked with the supplier of the welding
electrodes.
HINTS
• Please note the corresponding user hint
in regard of the welding filler materials
(see Table 4).
• All weld seams must be carried out with
the same temperature.
• Do not weld at the heat treated load ring.
•
The distance lugs assist in achieving the
correct root weld (ap-
prox. 3 mm = 0.1 inch).
They may not be remo-
ved.
Pic. 1: distance lugs
1 Start tacking at the center of the weld-on block.
2 Check function of the suspension ring (must be able
to pivot 180°). If necessary please correct.
3
Weld root layer, interlayer and finally top layer.
HINT
• Clean carefully the layers before wel-
ding of inter- and top layers.
• Remove visible missing sections.
Details about weld seam type and size can be
taken out of
Pic. 1
and from the
Table 2
/
Table 4.
HINT
Weld in string beads.
Type
size
length
volume
VLBS-U-LT 2.5 t HV 7 + a 3
2 x 40 mm
approx. 2.6 cm³
VLBS-U-LT 4 t
HV 8 + a 3
2 x 46 mm
approx. 3.2 cm³
VLBS-U-LT 6.7 t HV 12 + a 4
2 x 60 mm
approx. 8.7 cm³
VLBS-U-LT 10 t HV 16 + a 4
2 x 60 mm
approx. 15.5 cm³
Table 2: Weld seam (weld-on block)
distance lugs
approx. 3 mm (0.1-0.2 inch)
spring
Pic. 2:
Welding seam definition
HINT
By the position of the weld-seam (HV conti-
nuous fillet weld seam) the following requi
-
rements will be observed: DIN 18800 steel
constructions requires: at outdoor buildings, es
-
pecially when endanger of particular corrosion
may occure, all weld seams shall be carried out
as circumferential continous fillet weld seams.
The countinous fillet weld seam at the
VLBS-
U-LT
weld-on block fulfills the requirements
and guarantees a connection through the
whole cross section of the material.
4 Please check by a competent person after welding
the ongoing usage of the weld-on lifting point (see
section 4,
Inspection / repair / disposal
).
