Compulsory contacted nozzles

 

 

Clean welding seams with straight welding wire

 

 

With a straight welding torch a success is only possible, if the appropriate contact tip is being used. In this connection we show you, how simple it is to avoid failure from the very beginning. The advantages of a welding wire unwinding coiler are clear. The welding wire is being uncoiled without any twisting and therefore comes out straight and torsion-free.  But the desired success while welding still often fails to come. We examined what causes this and ascertained, that the error was due to the wrong contact tube in the machine or robot torch.  With a regular contact nozzle (not compulsory contacted ) the naturally bent welding wire, which comes off the reel spool, receives its welding current at three spots,  namely at the inflow and the outlet of the contact nozzle and at the highest point of its bending, located roughly in the middle of the contact tip.  If you take a straight wire now,  instead of the bent one, all existing "friction" and "interference" over which the transmission of the welding wire took place so far, is simply eliminated! The welding wire, which is always a few tenth of milimeters thinner than the nozzle channel literally falls through the contact tip. A transmission of the welding current to the welding wire can now undisturbedly take place.

 

The result is well known: uneven, inaccurate and squirted welding seams, like shown in the picture below to the left. But how can a welding seam of highest quality be achieved, such as shown in the picture below to the right? Even in the welding technology this applies: the right choice of tool determines the quality of the product. Therefore, when using straight wire, the contact tube has to be compulsory contacted. Due to being compulsory contacted, the welding wire is guided and ensures an interruption-free passage of current. Only that way you achieve a smooth, spatter-free and contour-fitting welding seam.

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