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Heat input vs arc energy (ASME IX vs EN 1011-1)

Heat input vs arc energy (ASME IX vs EN 1011-1)

Postby mohd » Fri Oct 18, 2013 11:19 am

dear experts,
Q1: Why ASME IX heat input formula does not take into account the thermal efficiency factor of welding process (see QW-409.1) but as per EN 1011-1 it shall be considered?
Q2: Without considering the thermal efficiency factor of welding process does ASME IX heat input formula actually reflect the "arc energy"?
Q3: Is the thermal efficiency factor of welding process considered to be significant whenever we shall perform critical application weldings as per ASME IX?
regards,
mohd.
mohd
 
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Re: Heat input vs arc energy (ASME IX vs EN 1011-1)

Postby wefel » Sat Oct 19, 2013 8:52 am

As you have told the ASME IX equation actually calculates the arc energy and not the "real" heat input as the EN 1011-1 does but it doesn't make sense when we are to qualify a welding procedure since either in the one or in the other case the calculated heat input of a specific process of the PQR isn't used in order to be compared with the heat input of another process but with the heat input of the same process during production welding. Regarding your query for the performance of critical weldings as per ASME IX, there is no reason to consider the efficiency factor of welding process since it isn't specified by the heat input equation of that code. However, if we are to compare different welding processes then we shall consider the thermal efficiency factor of each welding process and use the EN 1011-1 equation since ASME IX equation is useful only for comparing different WPSs which use the same welding process.
wefel
 
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Re: Heat input vs arc energy (ASME IX vs EN 1011-1)

Postby Logosweld » Thu Apr 24, 2014 4:59 pm

wefel wrote:As you have told the ASME IX equation actually calculates the arc energy and not the "real" heat input as the EN 1011-1 does but it doesn't make sense when we are to qualify a welding procedure since either in the one or in the other case the calculated heat input of a specific process of the PQR isn't used in order to be compared with the heat input of another process but with the heat input of the same process during production welding. Regarding your query for the performance of critical weldings as per ASME IX, there is no reason to consider the efficiency factor of welding process since it isn't specified by the heat input equation of that code. However, if we are to compare different welding processes then we shall consider the thermal efficiency factor of each welding process and use the EN 1011-1 equation since ASME IX equation is useful only for comparing different WPSs which use the same welding process.

good strategy for welding process
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