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  • Welding head deck

    Hello Guys/welding guru's. Ok yet another cylinder head welding question. Here is my issue i have a BMW K1200 motorcycle head that i am putting on a A series brit block. been working out different ways of putting it together and came up with the idea of welding the entire deck of head so that in the end i will solve several issues like how far to pocket the pistons, retain the squish pads and lower compression all in the process of adding about .080 of aluminum to the deck. Tentative plan is to bolt the head to a strong back of steel and heat a few hundred degrees then weld the deck with a TIG using 1/8 4043 rod
    Wondering what is best, weld a few passes and cool then continue on or do i just do pass after pass until the whole surface is welded and let cool slowly. just a side note the head is a DOHC and has several decks and levels in it the deck surface is fairly small for the size of the head and i don't plan on welding inside of the chambers except a little on the deck part of the squish pad. Of course i will have the head surfaced afterwards. Hydro

  • #2
    Originally posted by Hydrolastic View Post
    Hello Guys/welding guru's. Ok yet another cylinder head welding question. Here is my issue i have a BMW K1200 motorcycle head that i am putting on a A series brit block. been working out different ways of putting it together and came up with the idea of welding the entire deck of head so that in the end i will solve several issues like how far to pocket the pistons, retain the squish pads and lower compression all in the process of adding about .080 of aluminum to the deck. Tentative plan is to bolt the head to a strong back of steel and heat a few hundred degrees then weld the deck with a TIG using 1/8 4043 rod
    Wondering what is best, weld a few passes and cool then continue on or do i just do pass after pass until the whole surface is welded and let cool slowly. just a side note the head is a DOHC and has several decks and levels in it the deck surface is fairly small for the size of the head and i don't plan on welding inside of the chambers except a little on the deck part of the squish pad. Of course i will have the head surfaced afterwards. Hydro
    Inline 4..??

    PICS..??

    think you will find 4943 a better filler choice..

    Alloy 4943 filler metal was formulated to be welded with the same weld procedure specifications as 4043 and 4643, and does not depend upon dilution from the base metal during welding to increase the strength of the weld deposit, while maintaining the same weld characteristics and benefits of 4043 and 4643. Features/Benefits: - 25% higher UTS & 50% higher yield strength than 4043 in the as welded condition (typical) - Moderate/high strength (35 ksi typical) - Low melting temperature/high fluidity - Low welding smut and discoloration - Low ductility, formability, and lower toughness (similar to 4043) - Moderate electrical conductivity and thermal conductivity - Post weld fully heat treatable requiring no base metal dilution - Excellent corrosion resistance - Low shrinkage rate/reduced distortion - Low hot cracking sensitivity in most applications


    Type and model TIG machine..??

    Just curious... might it not be easier to make an aluminum spacer plate and use a second head gasket??
    Last edited by H80N; 03-26-2015, 12:30 PM.
    .

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