customer of mine is having trouble with welds made on 1045 steel to a-36 mild steel conveyor system made of 4'' i-beam which is the 1045 steel welded to a-36 mild steel plate one inch thick welds are about 4 in. long skipped welded all along the out side of the one in. plate. also i-beam has a 1/8 sheet steel formed in shape of 4'' channel welded on top of it 25 ft. long 4'' weld every 18'' welds just pull off of the 1045 in some spots no cracks just comes off the i-beam after it cools some times it is hanging in the paint booth and then it starts popping welds in different areas on the i- beams. told them to pre heat to 250 before welding. any have any one dealings with this ?
filler metal is esab flux core wire e71-t1 welding in flat position 26 volts 260 amps size .045 no welds longer than 3 or 4 inches. skip welded hanger plates are a-36 1in. in shape of a square horse shoe the beams are cold rolled in s like shapes around 25 ft. in length these are part of a conveyor system that hangs in the air.
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