Petol BA118, Руководство по эксплуатации, Страница: 24 / 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.