Welding Heat Input
Compute the heat input of a weld, H = (V·I·60)/(v·1000), in kJ/mm, from the arc voltage (V), the current (I) and the travel speed (v, in mm/min). It is one of the most important welding parameters: it controls the cooling rate, the microstructure, the heat-affected-zone hardness and the cracking risk. High input softens and distorts; low input hardens and embrittles. Enter the voltage, the current and the travel speed.
Result
—
Aporte térmico (soldagem)
O aporte térmico (heat input) é talvez o parâmetro mais importante da soldagem: quanta energia, por milímetro de cordão, entra na peça. H = (V·I·60)/(v·1000) kJ/mm combina a potência do arco (tensão × corrente) com a velocidade de avanço. Seu efeito é profundo — controla a velocidade de resfriamento, que por sua vez governa a microestrutura, a dureza da zona afetada pelo calor (ZAC) e o risco de trincas. Aporte alto resfria devagar, amolece a junta, aumenta a distorção e pode causar grãos grosseiros; aporte baixo resfria rápido, endurece e fragiliza a ZAC, favorecendo trincas a frio. Cada material e espessura têm uma faixa ótima especificada no procedimento de soldagem (EPS/WPS). Informe a tensão, a corrente e a velocidade de soldagem.
Related Tools
Welding Travel Speed
Compute the welding travel speed (arc advance) by dividing the bead length by the time taken, in mm/min. It is a fundamental parameter that, together with voltage and current, defines the heat input: welding too fast produces narrow beads with little penetration; too slow overheats and deposits excess material. Enter the bead length and the welding time.
Weld Dilution
Compute a weld's dilution, D = (melted base-metal area / total bead area)·100%, the proportion of the bead that came from the base metal rather than the filler. It is crucial in cladding and dissimilar-metal joints: high dilution mixes in more base metal, altering the bead's composition and properties (anti-corrosion cladding aims for low dilution). Enter the melted base-metal area and the total bead area.
Casting Cooling Modulus
Calculate the cooling modulus (or geometric modulus) of a casting, M = V ÷ A, dividing the volume V by the surface area A in contact with the mold. The result, in cm (length unit), is the parameter governing solidification speed: the larger the modulus, the slower the solidification (Chvorinov's rule says the time is proportional to the modulus squared). It is the basis of riser sizing in foundry — the modulus rule requires the riser modulus to be about 1.2 times that of the part, so it solidifies later and feeds the shrinkage, avoiding shrinkage cavities. Enter the part volume and area.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.