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Brazing cracks in thin sheet metal.
Braze welding unlike brazing goes beyond capillary action and deposits a strengthening thickness or bead of brazing material in braze weld.
Finally brazing fluxes have a tendency to cause hydrogen embrittlement in the metal adjacent to brazed joints and this can cause cracking in that metal as panels vibration cycle over miles and time.
Apply the brazing rod to the joint while continuing to heat the metal surfaces.
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Because of this you don t need the base metals to be similar so it s possible to tig braze copper to stainless steel as an example.
If needed use clamps to secure the pieces in position.
Heat the joint where the two pieces of metal will meet until the joint glows.
Weld the excavation from the outside.
Quench only after the braze filler metal has solidified to avoid cracks or rough braze joints.
You should now have a complete joint penetration weld that is as strong as the original member assuming it is low medium carbon steel.
A convenient method of preplacing filler metal is by using a brazing sheet an aluminum alloy base metal coated on one or both sides.
Have you ever welded something so thin and worn out that all you do is blow holes in it.
The filler material flows into any and all microscopic crevices in the metal and pulls the pieces together similar to a permanent velcro.
A third method of applying brazing filler metal is to use a paste mixture of flux and filler metal powder.
Extend the excavation at least 1 2 inch beyond the visible crack tip.
Position the metal as desired.
Note that quenching can affect base material mechanical properties.
Do not quench materials with large differences in coefficients of thermal expansion to avoid cracks in the base materials and tears within the braze alloy.
Heat treatable or core alloys composed mainly of manganese or magnesium are also used.
