Abstract: The talc-filled ABS compounds were prepared by melt blending, and the effects of talc content and size as well as lubrication on their weld line strength were investigated. The micromorphology of the interface between weld line and dispersed fillers was observed with scanning electron microscope. The results indicated that the weld line strength of the compoundsdecreased due to the barrier effect on diffusion and fusion of macromolecular chains by talc sheets. Theweld line strength of ABS could be improved effectively by incorporation of talc at a low content, mixture of talc and wollastonite, or amide lubrication with polar groups. The ABS compounds achieved the weld mark strength of 33.4 MPa when 5 wt % of talc, 5 wt % of wollastonite and 1 wt % of modified amide lubrication were added.