Estimate time required to preheat weld joints using rosebud or multi-flame tips based on material mass and target temperature
Input Parameters
Results
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Estimated Preheat Time
min
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Total BTU Required
BTU
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Mass Being Heated
lbs
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Tip Recommendation
Note: Preheat times are estimates. Use temperature indicating crayons or pyrometer to verify. Wind shields improve efficiency significantly.
Reference
Time (min) = BTU_required / (BTU_rate x efficiency) x 60
BTU = mass x Cp x deltaT
Steel: density 0.284 lb/in^3, Cp 0.12 BTU/(lb*F)
Torch efficiency ~40-60% in open air