Abstract
The circular array structure is fabricated on the 304 stainless steel surface by fiber laser, and it is connected with the plastic under the condition of heating and pressurizing. The effects of heating temperature, connection pressure and coverage rate on the interfacial strength of the 304 stainless steel and plastics were studied, and the optimum process parameters of heating temperature and bonding pressure are obtained. The results show that the shear force of 304 stainless steel and plastic is the strongest when the heating temperature is 400 C. The strength of the connection joint is enhanced with the increase of the connection pressure, and the shear force of the 304 stainless steel and plastic connection joint is the strongest when the pressure is 70 kN. After laser treatment, the height and quantity of burr in the circular array structure have an important influence on the connection strength between stainless steel and plastic. The number of burrs in the height range of 10–20 μm is defined as Hm, which is main factor controlling the shear strength. When the Hm value corresponding to the burr height of 10–20 μm is less than 14.82%, the metal and plastic damage from the connection joint, and the connection strength increases with the increase of Hm. When the Hm is greater than 14.82%, the connection strength between stainless steel and plastic is more than that fracture strength of the plastic. And the shear force floats between 893N and 962 N, this is consistent with the average shear fracture force of plastics 946 N. The coverage rate of laser processing area has influences on the connection strength and machining efficiency. The results show that the corresponding minimum coverage rate is 38.5% when the stainless steel and plastic connection joint is damaged at the plastic, at which time the shear force is 901 ± 14.18 N.
Published Version
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