BOGIES AND SUSPENSION - South Central Railway

CHAPTER 6 – BOGIES AND SUSPENSION
WAGON MAINTENANCE MANUAL
Page 69 of 121
(v) The Broad Gauge leg type of axle guards, if repaired by welding or
patching, should be provided with cross-bracing.
III. WELDING OF MANGANESE STEEL LINERS ON ROLLER BEARING
AXLE BOXES.
The procedure to be followed at the time of welding manganese steel liners on
axle boxes will be as under :-
(i) Process - Only manual metal arc process with RDSO approved brand of
electrodes suitable for welding Manganese Steel should be
used.
(ii) Weld Position - The welding shall be done in down hand position.
(iii) Electric current characteristics - The current used shall be direct
current (D.C.) keeping the electrode positive and the work piece negative.
The current value should be according to the electrode manufactures
recommendations.
(iv) Fit up and Welding Technique
Prior to welding, the liners shall be clamped squarely in place to
hold them flat against the housing. Clearance between liners and
the prepared lug surface before and after welding shall not exceed
.006” (0.152 mm).
Care must be taken to prevent cracking of liners.
Clamp the liners, check the dimensions/alignment, adjust if
required and tack weld if correctly aligned.
IV. The axle box body (casing) should be either preheated or immersed in water as
detailed below:-
Procedure No. 1 : Pre-heating method –
The axle box casing should be preheated uniformly to about
250 o C-300 o C before welding is undertaken and then placed in
position to facilitate down hand welding.
On completion of welding the axle box casing should be allowed to
cool in still air.
Procedure No. 2: Submersion under water –
The axle box casing should be immersed under water in a suitable
container duly earth. The level of the water should be such that
only guide portion (lug) requiring welding remains above waterlevel.