▎ 摘　　要

NOVELTY - Non-silver-based solder comprises 39-41 wt.% silver, 29.5-31.5 wt.% zinc, 2.5-3.5 wt.% tin, 1.3-1.7 wt.% nickel, 0.1-0.2 wt.% indium, 0.05-0.10 wt.% cobalt, 0.01-0.02 wt.% graphene, and balance copper and impurities. USE - Non-silver-based solder. ADVANTAGE - The non-silver-based solder produces stainless steel welding joint strength of 140 MPa, has good spreading properties, and has good plasticity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of non-silver-based solder by grinding raw materials except for graphene to obtain 100-150 meshes powder; adding graphene to alcohol; ultrasonic treating; putting graphene alcohol solution and alloy powder into high-energy ball mill; ball milling for 150-200 revolutions per minute at 150-200 degrees C for 10-15 minutes; drying ground graphene and alloy powder mixture; putting dried mixture into grinding tool; extrusion molding; and sintering powder at 250-300 degrees C for 3-5 hours to obtain aluminum-magnesium alloy solder.