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wide of bead weld
- Thread starter duongwe
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If you are working to AWS D1.1-2010 and you qualify the welding procedure by testing in accordance with clause 4, Part B, the ranges for voltage, wire feed speed (when applicable), amperage, and travel speed is a function of the values or ranges recorded on the PQR.
If for example you qualify a welding procedure for GMAW spray mode transfer, you would record the actual values of the welding parameters used to weld the test coupon. If you recorded 27 volts, 225 amps, 375 inches/minute for the wire feed speed, and your travel speed was recorded as 8 ipm, whether you used a weave or stringer technique would not be important.
Using Table 4.5, you would be permitted to list the following ranges on the qualified WPS:
Voltage: 27V +/-7% or 25 to 29 volts rounded to the nearest volt
Amperage: 225 A +/-7% or 203 to 248 amps rounded to the nearest amp.
You would refer to Table 4.5 for the other welding parameters to determine the permitted ranges.
The width of the weld bead is a function of travel speed and side to side oscillation. Side to side oscillation is not a welding variable that is listed.
The welding code lists those variables that must be considered. The contractor/manufacturer must include any other variables felt to influence their welding operations. If in the opinion of the contractor, it is prudent to limit the width of the weave, he may do so even though it is not an essential variable per D1.1 Table 4.5.
The reality may be that the welder varied the travel speed for each weld bead deposited. In that case, I use my handy Excel program to determine the mean value for the travel speed and use that value as my recorded value on the PQR. As back up, I record the parameters of each and every weld bead deposited to substantiate the values used to determine the ranges on the WPS. The data table becomes part of the PQR.
Best regards - Al
If for example you qualify a welding procedure for GMAW spray mode transfer, you would record the actual values of the welding parameters used to weld the test coupon. If you recorded 27 volts, 225 amps, 375 inches/minute for the wire feed speed, and your travel speed was recorded as 8 ipm, whether you used a weave or stringer technique would not be important.
Using Table 4.5, you would be permitted to list the following ranges on the qualified WPS:
Voltage: 27V +/-7% or 25 to 29 volts rounded to the nearest volt
Amperage: 225 A +/-7% or 203 to 248 amps rounded to the nearest amp.
You would refer to Table 4.5 for the other welding parameters to determine the permitted ranges.
The width of the weld bead is a function of travel speed and side to side oscillation. Side to side oscillation is not a welding variable that is listed.
The welding code lists those variables that must be considered. The contractor/manufacturer must include any other variables felt to influence their welding operations. If in the opinion of the contractor, it is prudent to limit the width of the weave, he may do so even though it is not an essential variable per D1.1 Table 4.5.
The reality may be that the welder varied the travel speed for each weld bead deposited. In that case, I use my handy Excel program to determine the mean value for the travel speed and use that value as my recorded value on the PQR. As back up, I record the parameters of each and every weld bead deposited to substantiate the values used to determine the ranges on the WPS. The data table becomes part of the PQR.
Best regards - Al
As per AWS D1.1, Table 4.6 for Electical Characteristics the following statement regarding Oscillation as essential parameter is described
"A change exceeding ±20% in the oscillation variables for mechanized or automatic welding - for SAW, GMAW, FCAW, GTAW Process"
"A change exceeding ±20% in the oscillation variables for mechanized or automatic welding - for SAW, GMAW, FCAW, GTAW Process"
doniafrizal
Petroleum
Hi Vijay999,
AWS D1.1 Table 4.6 is supplementary essential variable, so it will be only essential if any CVN requirement.
AWS D1.1 Table 4.6 is supplementary essential variable, so it will be only essential if any CVN requirement.
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