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Thermal cracking. In thermal cracking, high temperatures (typically in the range of 450Â°C to 750Â°C) and pressures (up to about 70 atmospheres) are used to break the large hydrocarbons into smaller ones. Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds - alkenes.
Cracking in WeldsWe know that several types of imperfections may occur in a weld or the heat affected zone. Welds may contain porosity (see last months HERA News) slag inclusions, lack of fusion or cracks. Cracks in a weld are almost certainly the most unwanted of all weld imperfections.