Note welding
a) welding groove and Welding Material processing is necessary to meet the requirements;
b) the arc with closing arc from the arc in the the arc plate or closing panel;
c) weld contact with the media should be final welding, this will help to improve the corrosion resistance of welded joints;
d) welding process of welding heat input and interpass temperature control to be strict;
E) to mitigate intergranular corrosion susceptibility of nickel alloy welded joints in the state after welding, multi-pass welding in the Welding Accessories process, starting from the first two weld recommend using forced water back seam.
The appearance inspection as well as the non-destructive testing
The surface of the weld and heat affected zone 100% inspection, there should be no cracks, lack of fusion, porosity, undercut, craters, inclusions, unfilled defects such should not have to fight the arc spot weld outside. Weld and base metal should be smooth transition.
Non-destructive testing of welds perform JB/T4730-2005 "pressure equipment and non-destructive testing standards. 100% RT detection of weld joints, reaching grade â…¡ qualified; 100% PT detection of welded joints to achieve Class I qualified.