FOCUS ON PROPER WELD SIZE WHEN DEVELOPING WPS PARAMETER RANGES

Production D  preparing for the structural steel project, which must be consistent with the American Welding Society D1.8 Seismic Supplement 0045 and want to use the gas E71T-1 core ( FCAW-G) son. Manufacturer luxury  set  steel, it , can be welded to the flat position.
Would you like to use wire  the manufacturer, but the rate at which heat test high / low  input  envelope was not that of the D1.8. It should be pointed out when they travel speed welding characteristics (WPS). There's a reason why the speed is not listed?
Although the  much more we could to speed up the transfer directly with the WPS to appear in the same way can be a good idea. Although some simple calculations necessary and regular, but n , there is no reason to be intimidated by numbers or equations in welding.

Finally, it , remained in the current 160 A 215 A and voltage of 24V to 26V listed u200b u200bWPS seems to have some justification  saw that speed. However, there is a problem with this logic, if the value of the u200b u200bof than 215 amps and 26 V are used. Again, the wire speed , supply causes higher efficiency.

Figure 3 shocs the  input resulting from welding in that scenario. Of course, 116 kJ / was too high,  heat for use with flux cored wire. Some problems that can occur when using 116 kJ / in  include reduced heat  notch Charpy impact properties in the shape of letter V in the solder, l  question of the basic material in the affected zone heat (HAZ), or the lack of penetration and / or connection (such as  cross handle the set of d  water). In addition, the heat exceeds  maximum thermal energy   envelope  set in D1. 8 CERT.

Consider the reverse situation. And if the travel is the fastest (10.8 ppm), and the latest (160) and voltage (24 V) parameters are used u200b u200bdurante production or  erection? Of course, this will result in welding heat in less than 30 kJ / certificate is D1.8. But why is this important?
Answering this question depends on the size of the bead is big enough (and thus , welding heat is large enough), against the  plates weld. Joints that are too small, can contribute to a cable break or a house. There should be exactly the welds would be good with these procedures, ultra-low heat.

Our task at this stage, harken back to a previous column ( Speed \u200b\u200bu200b u200b u200b u200b u200b u200bVoyage Pre-Calculus staggering speed and voltage,  Welding Tips, November-December 2010), where my colleague Kevin Beardsley discussed pre-compute the speed, while the deposit rate and the desired weld size are known. As you can see from Table 2 (part of this column) d  joints, which weighs 0.102 pounds per foot corresponds to the weld d  angle less than  room the size of your feet.

So if you decide you really like the E71T-1 electrode operates at a speed of 275 ipm  power cord, 160 A, and 24V, What is the speed limit to travel and can spend more of another weld, with  liquid equivalent of ¼? It  is simply a matter of moving the model in Figure 4 for s  ensure that  return  ¼ minimum weld d  kat is made, the speed can be faster than l  IPM 8.6, as shown in Figure 5 Compare this result with  10.8 D1.8 IPM was extracted from the certification tests.

Now, if an upper limit on the speed with which the thought process of the lower speed limit? How slow is too slow? The above scenario is not acceptable, it u200b u200bciepla 116 kJ / achieved a higher voltage and current settings and used a slower travel u200b u200bcom of change, taken directly from the certificate D1 0.8.
Having achieved the ultimate goal of building   conservative , the driving speed range of 6, 5 to 8.6 ipm ipm, increasing the chances of a strong bond. Range 2.9 to 10.8 ipm ipm highlight D1.8 certainly wrong in the worst case. This is the main reason why the speed is not included in D1.8 qualified manufacturer.
Finally, the manufacturing and assembly in order to determine the most suitable speed range for a given application is not a  who blindly support the qualified products. According to the methodology described above is a possible model for how this can be achieved.

Posted in: USA