Fixing device and method for bellow

The invention provides a fixing device and method for bellow. The fixing device includes a press head device, a supporting platform (6) and a supporting seat (7), the supporting platform (6) is mounted on the supporting seat (7), the press head device is arranged above the supporting platform (6), a fixing area is formed between the press head device and the supporting platform (6), the bellow (5)is placed inside the fixing area, one end of the bellow (5) is connected with the supporting platform (6), the other end of the bellow (5) is connected with the press head device, and the press headdevice is capable of applying a tensile force to the bellow (5) in the fixing area. The fixing device and method for the bellow are suitable for many kinds of raw material thickness range, such as foil, thin plates and even thick plates, are suitable for single layer, multi layers and the other structures, are further suitable for many welding methods, such as micro beam plasma welding, electron beam welding, precision arg