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Ultrasonic welds between crystalline and anmorphous polymers of PMMA-PLA and PMMA-POM are carried out,especially for the immiscible materials pair of PMMA-POM.Both of the effects of welding conditions and the correlations between welding strengths and interfacial structures are discussed.For joint of PMMA-POM,the functional gradient materials made of PMMA,PLA and PMMA can be used as the IPS to achieve PMMA-POM welds successively,even though the nominal stresses decrease a little.