News

I. What are welding hot cracks? Welding hot cracks mostly occur at high temperatures near the solidus line, and are characterized by their distribution along grain boundaries. Sometimes they can also form along "polygonization boundaries" at temperatures below the solidus line. They usually occur within the weld metal, but may also occur in the heat-affected zone (base metal) adjacent to the welding fusion line. According to the mechanism, morphology, and temperature range of crack formation, welding hot cracks can be divided into four types: solidification cracks, liquefaction cracks, polygonization cracks, and ductility loss cracks.