2016年7月25日星期一

Factors affecting the performance of fully welded ball valve weld shape

Factors Affecting fully welded ball valve weld shape, performance there are many, but the most important for a number of welding parameters and welding conditions, the impact of all-welded ball valve weld shape, the performance of the main welding parameters welding current, arc voltage welding speed, wire diameter, etc., the impact of the valve weld welding conditions mainly weld groove shape, clearance and flux and wire piled high, the tip and the work piece inclination, etc., as we explain in detail below:
First, the impact of fully welded ball valve welding parameters on weld shape, performance
(1) The welding current. When other conditions remain unchanged, deep penetration welding current is proportional to the change in current, melt depth, height and width than inadequate; the current is too large, deep penetration, reinforcement is too large, easy to produce high-temperature cracking.
(2)The arc voltage. It is proportional to the arc voltage and arc length, arc voltage and the same welding current, if the choice of different flux, the arc electric field intensity is different, different arc length. When other conditions remain unchanged, the arc voltage is low, deep penetration, narrow weld width, is easy to produce hot cracks; arc voltage is high, the weld width increases, more than high enough. Submerged arc voltage is adjusted based on the welding current, i.e., the welding current must be to maintain a certain arc welding arc it possible to ensure stable combustion, so the range of variation of the arc voltage is limited.
(3) Welding speed. Welding speed has an impact on the penetration and weld width, usually inversely proportional to the depth of penetration and weld width and weld speed. Welding speed on the weld cross-sectional shape also affect the general welding speed is too small, the molten metal volume, poor weld; welding speed is large, the amount of molten metal inadequate, prone to undercut. The actual welding, in order to increase productivity, improve the welding speed while arc power must increase in order to ensure that the weld quality.
(4) Wire diameter. Welding current, arc voltage and the welding speed is constant, the depth of penetration is inversely related to the wire diameter, but the inverse relationship with the increase and decrease of the current density.
Second, the impact of fully welded ball valve welding conditions on weld form.
(1) The weld groove shape, the gap effect. In other conditions, while increasing the groove depth and width of weld penetration increases, weld width decreased slightly, reinforcement significantly reduced.
(2)The impact of the high flux reactor. High flux reactor shall ensure that the filament buried around the arc, generally 25 ~ 40mm. When using solder bonding or sintering flux, the dry density, high flux reactor higher than the melting flux of 20% to 50%. High Flux Reactor larger weld reinforcement bigger, more shallow penetration.
(3) Wire, dip the tip and the work piece has a greater impact on the weld. In the fully welded ball valve welding process, we should try to ensure that tip, the wire vertical dry surface.
Should you want to know more about ball valve from Reliable China ball valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.
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