Surface strengthening process for prolonging fatigue life of intersecting line position of inner cavity of pump head body of fracturing pump

• Main Authors: LI GUOJIE, WEI NONG, TIAN ZENG
• Format: Patent
• Language: Chinese; English
• Published: 12.06.2020
• Subjects: CHEMISTRY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

In order to solve the problems that the fatigue strength of an intersection line position of an inner cavity of a pump head body of a fracturing pump treated in the prior art is not high enough, the treatment process is complicated, the energy consumption is high and the like, the invention provides a surface strengthening process for prolonging the fatigue life of an intersecting line position ofan inner cavity of a pump head body of a fracturing pump. A laser impact strengthening technology is used for performing surface strengthening treatment on a weak position of the 4330 steel pump headbody; the power density of laser is (2 to 9)*10 W/cm ; the laser pulse width is 8 to 20 ns; an adsorption protection layer is a black adhesive tape or black paint; and a restraint layer is water. Through the laser impact strengthening technology, the fatigue life can be at least prolonged to more than 2.05 times. After the laser impact strengthening treatment, in a sub-surface layer 0.2 mm position, the residual compressi