How to Avoide the Welding Crack of Cast Iron (Report 1)

Abstract

A simple method-to avoide the welding crack of cast iron is described here.
Before welding, shallow glooves were made on the surface of mother metal adjascent to the V-groove as shown in Fig. 6. Cast iron was repaired by nickel electrode or mild steel electrode with standard welding procedure of cast iron which contains low welding current, intermittent welding and peening of the deposit etc. The occurence of welding crack was diminished remarkably by the effect of these shollow grooves.
As the reasons, geometrical surface ductility and ductility accompanied by the instantenous high temperature caused by the gloove at the surface adjascent to the weld may be taken into account. Table 1 shows the maximum temperature which can be measured and the apparent elongation measured at the gloove.