Yeah man so here’s my suggestion from my experience with cast you’re gonna want to get a Ni-55 or Ni-77 electrode (try tractor supply co if you have one in your area they usually have special rods like that if you don’t have one get them off amazon but it’s necessary you get these specific nickel based rods I’m not sure of your level of skill but this is the easiest steps to take and it being a lasting structurally sound weld is not guaranteed but that’s just the nature of cast so your gonna want to grind the area pretty deep past the surface of both the block and the metal you’re wanting to affix to the block drilling holes at the ends of the joints to prevent crack propagation ( which is the process of a crack forming within a material for reasons relating to stress’s imposed on a material) then after you preheat the area to around 450-500 degrees Fahrenheit using the safest most effective method you have available you want to apply short staggered welds within the joint making sure they aren’t much more than an inch or so at a time and also making sure to thoroughly clean after each pass I recommend “peening”(hammering with low to medium force) the welds while they are still hot this will not only clean some of the slag off the welds but also relieve stress in the joint and compact the metal still brush the weld to make sure all the slag is removed very important to not weld over slag especially when dealing with cast another crucial component often forgotten about is post weld cooling regulation to prevent cracking from quench cooling or rapid cooling wrap the block in a blanket or if possible place it in a furnace to slowly cool down over the course of a few hours to even days to ensure rapid cooling doesn’t create problems in the welds integrity cast has high carbon content which causes it to cool more rapidly than most materials which is why this step is so important And also why it transferrs heat or cold so rapidly as well the more you know about the content of your pieces

These are the types of posts we like to see but yes it’s common to find people who aren’t aware that the machines voltage settings effect the way metal moves into the workpiece most actually only ever use short circuit which is I believe any voltage settings effect below 23v I may be wrong about that exact number but it’s around there do you know the other two methods of transfer