Heat source loading method and system suitable for complex large component

The invention discloses a heat source loading method suitable for a complex large component, which comprises the following steps of: constructing a thermoelastic-plastic finite element model of a typical joint, and determining a thermal cycle curve of a central position of a weld joint; zooming the thermal cycle curve in time according to the actual welding process to obtain a thermal cycle curveserving as a welding heat source; realizing a facth that a plurality of weld joints in the thermoelastic-plastic finite element model are equivalent to one weld joint, and loading a thermal cycle curve serving as a welding heat source. The invention further discloses a corresponding system. According to the method, a thermal cycle curve obtained through typical joint simulation serves as the basis, the thermal cycle curve serving as a welding heat source is calculated, then multiple (n) weld joints in the model are equivalent to one weld joint, the thermal cycle curve serving as the welding heat source is loaded, the