СПОСІБ ХОЛОДНОГО ЗВАРЮВАННЯ ТОНКОСТІННОГО ЧАВУНУ

Abstract

The purpose of the development is to improve the quality of the weld seam and its
technological feasibility when cold-welded thin-walled cast-iron casting with steel electrodes. This
is achieved by the fact that the welding is carried out at an angle of 80-90 with seams 5-6
thicknesses of iron on each side of the crack and welding in intervals between the intersections of
seams, alternately from the middle of the crack to its ends.
The researches were carried out at cold welding of gray cast iron with a thickness of 5 mm
by steel welding electrodes at constant current of reverse polarity. The diameter of the electrodes
was 3 mm. The current strength for electrodes with a diameter of 3 mm was 80-100 A.
After complete crack welding, the mechanical removal of the welded metal to the level of
the base metal was performed and repeated welding was performed using the same technology.
The welding was carried out without preheating. Seam metal removal was carried out with
an electric grinder.
As a result of investigations of welds, pores, cracks and other defects in welds and the
thermal impact zone were not found. The welding method meets the requirements of the weld seam
for tightness and durability.
The introduction of the cold-weld technique of thin-walled cast iron allows to improve the
quality of the weld, reduce the hardness of the welded metal and increase its processability without
the use of expensive special electrodes and complex technological techniques.