This Part of JB/T 4730 specifies the requirements for X-ray and γ-ray radiographic testing (RT) technique and quality classification of fusion butt welded joint in the metallic components for pressure equipment.
This Part is applicable to the RT for butt welded joint in the pressure components of pressure equipment in-fabrication, in-installation and in-service. The metallic base materials of welded joint include carbon stee1, low-alloy steel, stainless steel, copper/copper alloy, aluminium/aluminium alloy, titanium/titanium alloy and nickel/nickel alloy.
The RT techniques specified in this Part are classified as three grades: Grade A 一low sensitivity technique, Grade AB - medium sensitivity technique, and Grade B - high sensitivity technique.
The RT for butt welded joint in the relevant support commpoent and structure part of pressure equipment may also refer to this Part.
