The invention discloses an inner wall-
grinding and heat-chamfering device and method for an overlength large
diameter aluminum
alloy tube. The device comprises a rotary base, an aluminum
alloy tube, amain bracket, a guide bar, a guide bar supporting wheel, a substrate A, a guiding
powder device, a heat chamfering device, a substrate B, an auxiliary bracket, a
grinding head, a gentle mechanism anda
grinding head bracket, wherein the substrates are connected to the ground through expansion screws; the rotary base and the main bracket drive the aluminum
alloy tube to rotate; the grinding head is used for grinding a weld joint in the aluminum alloy tube; the guiding power device and the guide bar drive the grinding head to penetrate into the aluminum alloy tube to
grind the weld joint in thealuminum alloy tube. The device can overcome deficiencies that the manual grinding efficiency is low, the environment is severe, the grinding quality is poor and the like as flanges of the large
diameter aluminum alloy tube which is automatically machined by means of
friction stir welding effectively, and high efficiency, high quality and automatic grinding of the weld joint in the large diameteraluminum alloy tube by means of
friction stir welding is achieved.