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.

Nickel-base superalloy . Major alloying elements are chromium, tungsten, molybdenum, cobalt, aluminum , titanium, boron , zirconium, etc. . Wherein the chromium as an anti- oxidation and anti- corrosion, strengthening effect from the other elements . At 650 ~ 1000 ℃ high temperature have high strength and resistance to oxidation and corrosion of gas is the most widely used high-temperature alloys , high temperature strength in the highest class of alloys. The talents are scarce mainly nickel alloy bars Cheng LinIn the steel network of excellence . For the manufacture of aircraft engine blades and rocket engines , nuclear reactors, high temperature energy conversion equipment parts . ② nickel-based corrosion resistant alloys . Aluminium Welding Electrodes are copper, chromium, molybdenum . Has a good overall performance, resistance to corrosion and stress corrosion of various acid . The first application is the nickel-copper alloy , also known as Monel ; addition to nickel-chromium alloys, nickel-molybdenum alloys, nickel- chromium-molybdenum alloy. For the manufacture of a variety of corrosion-resistant components. ③ resistant nickel-based alloys. Main alloying elements chromium, molybdenum , tungsten, but also contains small amounts of niobium , tantalum and indium . In addition to having wear resistance , its resistance to oxidation, corrosion , welding performance is good. Wear parts can be manufactured , can also be used as coating material , by means of welding and coating process to be coated on the other surface of the substrate . ④ nickel-based precision alloy . Including nickel-based soft magnetic alloys , nickel-based alloys and nickel-based precision resistance heating alloys. The most commonly used soft magnetic alloy containing 80% nickel- nickel alloy with Lin ChengPermalloy so , the maximum magnetic permeability and high initial permeability , low coercive force , in the electronics industry is important core material . Nickel-based alloy precision resistor main alloying elements chromium , aluminum, copper , this alloy has a Flux Cored Welding Wire, low temperature coefficient of resistivity and good corrosion resistance , for the production of resistors. Nickel-based heating alloys containing 20% of nickel chromium alloy with good oxidation resistance, corrosion resistance, can be a temperature of 1000 ~ 1100 ℃ long-term use . ⑤ nickel-based shape memory alloys. Ti- 50 (at)% nickel alloy . Its recovery temperature is 70 ℃, the shape memory effect. Small changes in the proportion of nickel titanium component , can reply to the temperature 30 ~ 100 ℃ range. Used for manufacture of spacecraft used automatically open structure, the aerospace industry with the self- excitation fasteners used on biomedical artificial heart motors.