The invention discloses a manufacturing method of a galvanized
water pipe internally coated with stainless steel. The method comprises the following steps that A, the surface of the galvanized
water pipe is polished, the burrs are removed, then the galvanized
water pipe is flushed with the
clean water repeatedly, and then the galvanized water
pipe is dried at the ventilation place; B, the surfaceof a stainless steel
pipe is polished and immersed into a decontaminant to remove the surface oil
stain, and then the stainless steel
pipe is flushed with the
clean water repeatedly and dried; C, a player of high-strength
adhesive is sprayed on the inner wall of the galvanized water pipe and the outer wall of the stainless steel pipe; D, the stainless steel pipe is sleeved with the galvanized water pipe; E, the stainless steel pipe is sleeved with a hole expansion mold for pipe expansion of the stainless steel pipe, so that the outer wall of the stainless steel pipe is completely stuck to theinner wall of the galvanized water pipe through the
adhesive; and F, finally, the end of stainless steel pipe exposed out of the two ends of the galvanized water pipe are bent by using a bending process, and then the end of the galvanized water pipe is fixed. The manufacturing method is simple in operation, the high-strength composite of the galvanized water pipe and the stainless steel pipe can be achieved, and the service life of the galvanized water pipe is prolonged.