The Marine Weld Vacuum Box is a dedicated non-destructive testing (NDT) instrument for weld tightness inspection on ship hull bottom plates and other steel structures. Using the soap solution bubble method under controlled vacuum, it reliably detects weld leaks and defects, supporting quality assurance in shipbuilding, nuclear power, machinery manufacturing, and general NDT applications. Required Conditions for Vacuum Box Tightness Testing Test Liquid Soap solution Vacuum