1 In this paper , the author analy diathermancy of the automat.

2 Therefore, based on the knowledge of diathermancy, BP Neural network is applied to predict three dimensional temperature field of slab in this paper.

3 With the equipments of lab and diathermancy theorem , it can be observed and analyzed, and its characteristics and law can be known well. By the way, its preponderance can be exerted to the full.

4 The test results show that the boiler has some good qualities, such as intensified diathermancy, cleaning combustion, high efficiency, energy saving, low pollution and long lifespan etc.

5 Impulse laser jointing has to choose right impulse energy and impulse width, and should put the stuff of low reflectivity, good diathermancy and thin on top.