Copper Casting Porosity
Casting defect in copper alloys caused by gas inclusions or insufficient feeding during solidification. This reduces the mechanical load-bearing capacity and tightness of the component.
Porosity in copper casting is caused by gases that get into the molten metal during pouring and can't escape during solidification. Often, shrinkage cavities also occur if the casting isn't properly fed. When welding, these pores are the classic cause of hot cracks because they weaken the joint. So when welding copper casting, you have to pay special attention to cleanliness and keep the heat well under control. If you weld into a porous area, the material quickly boils and cracks. Best to inspect the part thoroughly beforehand and grind away obviously bad spots before laying the weld.