INDULAY is an internal chromium carbide weld overlay process
designed to combat abrasion in piping systems used for the
conveyance of bulk materials.
INDULAY is cost effective where there is severe pipe abrasion.
Actual performance is dependent on the overlay thickness
and the systems operating conditions. Field results have
shown INDULAY to have a wear-life of 8 to 20 times that
obtained from regular carbon steel.
INDULAY is a unique process which gives a smooth continuous
overlay on a one piece pipe bend. It eliminates the need
for bends of segmented construction. Integral tangents can
be overlayed in the same continuous manner.
INDULAY can overlay pipe bends of any angle of any arc
pipe diameter is 3" (76.2mm), maximum 48" (1219mm).
INDULAY can be applied to straight pipe, tees and reducers.
Minimum diameter 3" (76.2mm), maximum length
Pipe bends and fabrications can be fitted with standard
ASTM flanges and coupling rings (see sidebar illustrations).
The INDULAY welding process is open arc flux core. Overlay
thickness is from 3/16" (5mm) to 9/16" (14mm).
The overlay can be placed in areas of high wear to maximize
life. Overlay options are shown on the left.
INDULAY has been developed to give maximum abrasion resistance
through the chrome carbide layer. This has been achieved
by the development of specialized welding techniques which
give an even dispersion of carbides across the chrome
layer and then minimum of dilution between the steel pipe
and the chrome carbide overlay (see below). Hardness
across the undiluted carbide overlay
is in the range of: 575 BHN (56 HRC) to 720 BHN (64 HRC).
INDULAY spools, if specified, can conform to ASME B31.3
Enlargement of chrome carbide matrix showing even dispersion
Photograph of chrome carbide overlay and steel pipe
showing minimal weld dilution at the interface.
INDULAY Bend Repair
Worn Bends of fittings of weldable alloy can be patched when worn through and
overlayed to bring them back to their original condition. Contact
us to speak
to a sales representative.
Type G – For severe abrasion moderate impact and temperatures up to
Type H – For temperatures up to 1700°F (925°C)
which is used
in conjunction with a stainless steel backing pipe.
During the overlay welding process the residual stresses from thermal
expansion and contraction are relieved by checking of the overlay deposit. This
checking is confined to the hard surface deposit and does not extend into the
pipe base metal. The check frequency is 2 to 4 per lineal inch.
Alloys for extreme
service conditions can be applied to suit customer's requirements.
WELD CHEMICAL COMPOSITION