GEARENCH LA116H PETOL Bull Tong - Manual (Page 24)

22
Weld Repairs
Scope:
This procedure is to be followed for minor repairs of crack indications in heat treated alloy steels. A
weld repair shall be considered minor when the depth of the cavity does not exceed 30% of the actual
wall thickness or 1 inch, whichever is smaller, or when the extent of the cavity does not exceed
approximately 10 square inches. Major weld repairs must be performed by GEARENCH™ or an
approved repair center using appropriate procedures followed by full heat treatment and load testing.
Application:
This procedure applies to steel castings, forgings and, wrought with carbon content between 0.15%
and 0.31%.
Weld preparation:
The crack indication is to be removed by carbon arc gouging, grinding, or machining until all
indication is removed. Magnetic particle inspection shall be used to verify that the crack indication
has been removed.
Filler material and process:
Repairs made with the FCAW process shall use a filler material of class E120T5-K4 or equivalent
with CO2 shielding gas. Repairs made with the SMAW process shall use a filler material of type E-
12018-M. All welding is to be performed by a qualified welder.
Preheat:
Preheat the weld area to 300°F minimum.
Interpass temperature:
The interpass temperature is to be 600°F maximum. All weld slag to be removed prior to application
of additional layers by chipping, grinding or wire brushing. Do not peen the weld repair.
Post weld heat treatment:
Do not allow weld to cool below 300°F before stress relief. Post heat immediately after welding to
1010 - 1040°F for 1 hour per inch of thickness, 2 hours minimum at temperature. Water quench after
stress relief.
Weld blending and inspection:
The weld is to be ground flush with the adjacent parent material. The weld is to be inspected by
magnetic particle to verify that the weld area is free of all crack indications.