DAIKOFCW 418

Weld metal derived from Monel alloy 400, enhanced with elevated levels of Mn and Ti to counteract hot cracking and porosity, employed for welding alloy 400 and similar materials within the Ni-Cu alloy system, such as pure nickel and cupronickel. While welds in alloy K500 are acceptable, they fail to match the strength of this precipitation-hardened alloy. Castings of alloy 400 with 1.5% Si or higher are prone to HAZ cracking. In dissimilar joints involving alloy 400 and other alloys or steels, sensitivity to dilution by Fe (20-30%) or Cr (3-6%) can result in diminished ductility in the weld metal near the fusion boundary. Direct welds to mild or low alloy steels are satisfactory with dilution control, although ERNiCr-3 wire is preferable and necessary for stainless and higher chromium alloys. Alloy 400 boasts a beneficial combination of strength, thermal conductivity, and resistance to corrosion by seawater, inorganic salts, sulphuric and hydrofluoric acids, hydrogen fluoride, and alkalis. Its applications encompass heat exchangers, piping, vessels, and evaporators in the offshore, marine, chemical, petrochemical, and power engineering industries. No preheat is required, and a maximum interpass temperature should be maintained at 150°C