For Grey Cast Iron Welding Method Is Preferable. In general the best results are obtained when welding with low current and the lowest practical heat inputs. High carbon content causes the carbon to form graphite.
The following is a step by step guideline on how you can fix cracked cast iron piece through the brazing method. We base the choice of welding process on personal preference but few factors remain to consider before the conclusion. Also it is an excellent option to minimize the extreme heating and cooling produced from the electric welding processes and it is easier to maintain the temperatures of the components with it.
Manual metal arc MMA welding known as SMAW in the USA is by far the most popular method for welding cast irons.
Some cast iron alloys are easier to weld than others. Practical tips for welding cast iron 1- To clean grease or other contaminants from cast iron heat the pieces uniformely to between 700 1000F 370. 2 REFERENCES namely grades FG 150 FG 200 FG 220 FG 260 FG 300 FG 350 and FG 400. This technique is commonly used to correct cracks on cast iron items.