Assembling method for marine diesel engine exhaust gas recirculation device shell

The invention provides an assembling method for a marine diesel engine exhaust gas recirculation device shell. The exhaust gas recirculation device shell is composed of an air cooler shell and a washer shell, and comprises an air cooler frame, multiple side plates, multiple flanges, a backpack, multiple rib plates, multiple steel pipes, a middle plate and a base plate. The assembling method comprises the following steps that S1, scribing is carried out on a platform; S2, the air cooler shell is assembled; S3, the washer shell is assembled; S4, combining assembling is carried out; and S5, the base plate is assembled. According to the assembling method, technological measures such as scribing and installation error control and proper allowance shrinkage are adopted, so that the problem thatwelding deformation is difficult to control due to multiple thin plates is solved, the beneficial effect of improving the quality of shell of an exhaust gas recirculation device (EGR) is achieved, andhas the advantages of bei