Abstract
Board thickness used steel ball shot materials of average particle size 0.6mm in a weld zone after MAG arc welding a rolling steel sheet (SM490A) for welding of 6mm and it processed shot peening and scavenging did a weld and I shall have done hot galvanizing afterwards and examined fatigue strength about the thing which there was not.
As a result,the strength of the coupling which it did not plate only by shot peening processing was improved remarkably, but it became clear I compared it with the thing which I did not plate,and to fall when it performed hot galvanizing.