焊 combines 火 fire with 旱 hàn, which means dry and also supplies the sound. It first meant drying something with fire. That grew to welding or soldering metal.
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Example Sentences
他在车间里焊接金属。
tāzàichējiānlǐhànjiējīnshǔ 。
He is welding metal in the workshop.
焊接技术对建筑行业很重要。
hànjiējìshùduìjiànzhùhángyèhěnzhòngyào 。
Welding technology is very important in the construction industry.