Installation Instructions; Mounting Bracket Installation - Cascade High-Visibility Viewmast II 35C Service Manual

Section
2 Installation Instructions
a
2.2 Mounting Bracket
Installation
(Continued)
2. Mounting bracket and crossmember welding must be
performed by a qualified welder only, using the following
procedures:
a. Disassemble the outer channel from the mast prior
to welding. Refer to Section 5.5-3 for disassembly
procedures.
b. Clean all surfaces to be welded. Remove paint, oil,
grease and other contaminants.
c. Locate the mounting brackets and crossmembers
on the mast channels.
Clamp in place with a "C" clamp. Protect the mast
channel inner surfaces from weld splatter.
d. Use only FCAW (Flux Core Arc Weld) AWS E70T-1
1/16 in. (15 mm) diameterwire.
e. Preheat the upright and mounting brackets to 100°F
(38°C). Monitor with a tempstick (crayon). Do not weld
in a drafty area.
WARNING: Weld areas that will be vertical
seams when the mast is standing upright
only. DO NOT WELD ANY HORIZONTAL
f. Weld areas that will be vertical seams when the mast
is standing upright only. DO NOT WELD ANY
HORIZONTAL SEAMS. See Figure 2.
g. Weld the mounting brackets and crossmember
with a .25 in. (6.4mm) minimum fillet, holding a close
arc. Weld in the flat position only. Do not oscillate or
use a wash bead pattern.
h. Weld each bracket in two passes. See Figure 2.
Run the first weld from the bottom of the bracket
to midpoint. Run the second weld from the top
of the bracket to midpoint and overlap the first
weld to eliminate arc craters. Let the weld slow
cool.
i. Remove slag and inspect the weld. The following
defects are not allowed: undercut, overlap, stress
cracks and porosity. Clean the weld area and repaint.
3. The measurement shown in Figure 3 should be taken
after welding and cooling the mast. This dimension must
be maintained for the uprights to slide together.
4. Reassemble the mast.
677736 Rev. 0
Clamp
Ground
Here
WARNING
A
DO NOT WELD THESE AREAS
HORIZONTAL WELDS WILL
REDUCE THE STRUCTURAL
STRENGTH OF THE CHANNEL.
WELD ON VERTICAL
Figure 2. Mounting Brackets.
o u te r
Upright
Top view
of Outer upright
At Two Places.
Figure 3. Dimensional Inspection.
3