heat input for pulse hot wire

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Hamid Firoozi

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Oct 27, 2015, 11:45:27 PM10/27/15

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Hello Experts

I`m looking for heat input formula for GTAW -Pulse- Hot wire process ,I got many different formula but I can not trust to the references.

So would you please share your information about this subject with me .

Thanks every body

pgoswami

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Oct 29, 2015, 11:12:11 PM10/29/15

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Hi Hamid,

Please see the extract from Sec-IX. Refer Non Mandatory Appendix-H for more details in addition to QW 409. If the power source used is of Non Waveform type then QW-409 a,b or c may be followed. Follow 409.1 (b) or (c) for waveform controlled welding. You may choose one of the 3 stated formula below depending on the power source type. The original formula, QW-4091(a) is the baseline formula for all welding engineers. The other two were adopted later.

Most precise way would be a combination of QW-409.1(a) & QW-409.1(C)-(2)

The ASME Section IX heat input measurement methods in QW-409.1(a) and QW-409.1(b), were developed at a time when welding power source output was relatively constant.

QW-409.1(c) more accurately reflects heat input changes when performing waveform controlled welding, but is also suitable for non waveform controlled (conventional) welding.

Thanks.

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineering Specialist

Hamilton, Ontario, Canada

pgos...@quickclic.net

pradip....@gmail.com

ca.linkedin.com/pub/pradip-goswami/5/985/299

QW-409.1(a)