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Effects of Welding Parameters and Process on Weld Seam:<\/p>\n
(1) Connect the current
\nWhen the welding current increases (other conditions do not change) , the weld penetration and residual height increase, dissolve width does not change (or slightly increase) , the reasons are as follows: 1, the location of heat source moved down, and the penetration increased. The penetration depth is almost proportional to the current. With the increase of current, the melting amount of welding wire increases proportionally, and the residual height increases because the solution width is nearly constant. 3 with the increase of current, the diameter of arc column increases, but the depth of arc penetration into workpiece increases, the moving range of arc spot is limited, so the solution width is nearly constant.<\/p>\n
(2) ARC voltage
\nWhen the arc voltage increases, the arc power increases, the heat input of the workpiece increases, and the arc length lengthens and the distribution radius increases, so the melting depth slightly decreases and the solution width increases, while the residual height decreases, because the solution width increases, the amount of welding wire melting is slightly reduced.<\/p>\n
(3) Welding speed
\nWhen the welding speed increases, the line energy decreases, the penetration depth, the width and the residual height decrease. This is because the amount of deposited wire metal on the unit length weld is inversely proportional to the welding speed, and the width is inversely proportional to the square root of the welding speed.<\/p>\n
Direct current connection: workpiece welding machine positive pole, welding torch welding machine negative pole;<\/p>\n
DC reverse: workpiece welding machine negative, welding torch welding machine positive.<\/p>\n
In general, the penetration depth and width of direct current reverse welding are larger than that of direct current direct welding, which is due to the larger energy released from the workpiece (cathode) . When direct current is connected, the welding wire is the cathode, and the melting rate of the welding wire is larger.<\/p>\n
The penetration depth of direct current direct welding is the largest and reverse welding is the smallest in TIG welding. Welding aluminum, magnesium and alloy have the problem of removing the oxide film on the surface of the molten pool. Welding other materials generally with direct current connection.<\/p>\n
(1) Incomplete penetration: the phenomenon of incomplete penetration at the root of the joint during fusion welding is called incomplete penetration. The causes are low welding current, high welding speed or improper groove size and wire not aligned to the center of the weld. When CO2 welding with short-circuit transfer of thin welding wire, this kind of defect is easy to occur because of low heat input of workpiece.<\/p>\n <\/p>\n
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