A welding head material for ultrasonic welding of plastics and its preparation method

Abstract

The invention discloses a welding head material used for plastic ultrasonic welding and a preparing method. The welding head includes, by weight percent, 0.3%-0.6% of C, 0.5%-1.0% of Si, 0.2%-0.8% of Mn, 1.0%-1.5% of Cr, 0.5%-3% of W, 0.5%-2% of V, 0.5%-2% of Mo, 0.05%-0.2% of Ce and the balance Fe. Quenching is conducted in water or oil at the temperature ranging from 800 DEG C to 900 DEG C; and then tempering is conducted for 2 h-3 h at the temperature ranging from 200 DEG C to 300 DEG C, and hardness ranges from 50 HRC to 58 HRC. The welding head prepared through the material is low in ultrasonic mechanical loss and cost, very high in strength and good in toughness, and is particularly suitable for conducting plastic filling or metal insert embedding through ultrasonic welding, the welding quality is good, the wear-resisting performance is high, and the service life is long.

Description

technical field [0001] The invention relates to a welding head material for ultrasonic welding of plastics and a preparation method thereof, belonging to the field of welding technology. Background technique [0002] Plastic ultrasonic welding requires different tool heads for different welding objects. Whether it is near-field welding or transmission welding, only half-wavelength tool heads can achieve the maximum amplitude of the welding end face. There are two types of tool heads with amplitude amplification and without amplitude amplification. The acoustic system tool heads for plastic welding machines are commonly used materials such as titanium alloy, aluminum alloy and steel. Titanium is light in weight, moderate in hardness and good in toughness, but expensive and difficult to machine; aluminum is light in weight and easy to process, but low in hardness and poor in wear resistance; steel is low in cost and has good strength and wear resistance. However, materials su...

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Problems solved by technology

Titanium is light in weight, moderate in hardness and good in toughness, but expensive and difficult to machine; aluminum is light in weight and easy to process, but low in hardness and poor in wear resistance; steel is low in cost and has good strength and wear resistance. Materials such as tool steel and stainless steel generally have the disadvantages of high ultrasonic mechanical loss and low impact fatigue strength.