124results about How to "Good wetting and spreading" patented technology

The invention discloses a method for brazing or fusion-welding through lasers with ultrasonic waves as auxiliaries, which relates to a welding method. The invention solves problems during processes that the lasers are used to braze or fusion-weld coating metals which has low melting points or dissimilar metals, and the problems are that wetting spreading property is bad, filling amount is not enough, stomatas and solders aren't welded fully and the like. The method of the invention is that during the processes that the lasers are used to braze the coating metals which has the low melting points or the lasers are used to fusion-weld the dissimilar metals, simultaneously, the ultrasonic waves with high-frequency vibrations are applied in welding zones which will be coagulated. The invention has the advantages that the occurrences of air holes can be minimized or avoided, and welding cost can be lowered. Welding solders can flow fully due to the high-frequency vibrations, which is beneficial for the wetting spreads of the welding solders and penetrations of the welding solders to the bottom portion of the welding zones, weld pool width and welding filling amount can be increased, the occurrences of welding defects as non-welding fully, undercuts and the like can be avoided, weld formations can be improved, and weld strength can be increased.

The invention relates to a method for brazing a diamond tool through lasers with the assistance of ultrasonic waves. The method includes the steps that firstly, a base body of a grinding wheel is manufactured through a machining method; secondly, the surface of the base body of the grinding wheel is coated with a brazing material; thirdly, diamond grinding particles are cleaned through dilute sulfuric acid, rinsed with deionized water and then dried; fourthly, the diamond grinding particles are subjected to laser surface texturing treatment through laser beams; fifthly, a diamond grinding wheel forming workblank is manufactured; sixthly, the surfaces of the diamond grinding particles are subjected to oil removal treatment and dust removal treatment; seventhly, the grinding wheel forming workblank is heated in a heating furnace, and the temperature is kept; and eighthly, the heated grinding wheel forming workblank is brazed through the lasers with the assistance of the ultrasonic waves, and a brazed single-layer diamond grinding wheel is manufactured. According to the method, release of stress between the diamond grinding particles and the brazing material is facilitated by the adoption of heating and heat preservation, meanwhile, the diamond grinding particles not too closely combined can fall off spontaneously after the high-temperature heat preservation process is conducted, and therefore potential defects generated after welding can be prevented.