Welding of heads of the blocks

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HelloI only start to study welding.I do of details of the engine (blocks, heads of blocks and the like)Therefore I am interested in repair of cracks in heads of blocks and block first of all.Having read the given forum and a lot of other literature I could not come to the idea what filler rods are better to use at TIG (GTAW) welding of aluminum heads of blocks and block.Filler rods can be written out in the following order as they are mentioned in literature ( the first is mentioned more frequently and so on)1 40432 40473 53564 Alloy 356From my experience I can tell that materials with what aluminum heads of blocks and blocks are made different  For example , BMW use one type of materials, Mitsubishi, Mazda, Kia use another type and so on.Therefore I wish to ask professional welders. What filler rods you use at work and what heads of blocks and blocks you weld?And second question.What is the right way to weld  cracks in cast iron heads of blocks and blocks? (TIG or STICK). And what filler rods or electrodes do you use for this purposeThanks
Reply:Wow I have never heard a head called a head of a block lol. Makes my head hurt trying to follow.Wish i could help you  more but I haven't done much along those lines yet. There are a couple awesome threads on here about welding cast iron though if you do a search.http://www.lincolnelectric.com/knowl...ronpreheat.asphttp://www.locknstitch.com/CastIronWelding.htmI also believe the   4 series rod is better for high temp aluminum applications like motors and I also think it's more compatible with the high silacone content of the cast. Hopefully someone can shine a little more light on that.Lincoln precision TIG 275Millermatic 140 MIG
Reply:Hello what i have found on alot of heads that i weld if you use 4043 the weld is very softand will brinell where the head gasket contacts the deck.    I have been using the 5356 rod and found that it works on A355 and A356 cylinder head castings . If you have access to the same material rod as the casting i would highly recomend using that.   One thing you will find with castings is they are very dirty even when new but when you mix all the contaminents of gases,carbon,antifreeze you find it can be very difficult to weldi still haven't been able to get clean welds on top as there is a bunch of junk that float to the top of the weld .    All i can say is preperation of the casting is the most important part of welding them .   Cast iron is not something that ihave fooled with but we do take them to a shop that spray welds them and it is a very succesful repair that we use what they weld as the seat material.           Good Luck in your journey          JakeLast edited by jakesporting; 12-04-2009 at 12:32 AM.