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How You can weld nickel aluminium bronzes? Aluminium bronzes are copper alloys containing, amongst other additions, up to 14% by weight of aluminium. Nickel aluminium bronzes are a subset aluminium bronzes which also contain nickel and often iron and manganese. Nickel aluminium bronzes are generally stronger than other aluminium bronzes and possess a two phase (duplex) microstructure. Nickel aluminium bronzes possess an alumina surface oxide that gives good corrosion resistance, however, this oxide can cause inclusions and other flaws during welding, if entrapped in the weld metal. Interpass and preweld cleaning must be employed to avoid this. As with all welding, general surface cleanliness will improve the quality of the weld. All aluminium and nickel aluminium bronzes undergo metallurgical changes in the HAZ and weld areas following welding which may lead to deleterious effects on the corrosion properties of the component. Depending on the severity of the service conditio...

How can the lack of fusion defects be prevented ? use a sufficiently wide joint preparation select welding parameters (high current level, short arc length, not too high a welding speed) to promote penetration into the joint side wall without causing flooding ensure the electrode/gun angle and manipulation technique will give adequate side wall fusion use weaving and dwell to improve side wall fusion providing there are no heat input restrictions if arc blow occurs, reposition the current return, use AC (in MMA [SMA] welding) or demagnetise the steel Join For PCN Welding Inspector Level 2 Program for Knowing More on Welding Technology and It's Details http://decibelnde.com/weldinginspector.php