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碱性低氢型涂药焊条长时间放置在大气中,药皮会逐渐吸收水分。由于这种吸潮作用破坏了低氢焊条的特性,所以在使用之前必须进行烘焙,以除去水分。按焊条生产厂说明书规定,焊接低碳钢和普低钢用的低氢焊条,“须经800～350℃烘焙1小时”;焊接60公斤级以上高强度钢用的低氢焊条,“须经850～400℃烘焙1～2小时”。这种要求的含意是:将焊条加热到300～350℃和350～400℃,然后,在这一温度下持续(保温)1～2小时。其目的在于,使焊条药皮中的结晶水、潮气等充分逸出,使焊条干燥。
Alkaline low-type coated electrodes for a long time placed in the atmosphere, the skin will gradually absorb moisture. Since this moisture absorption destroys the characteristics of the low-hydrogen electrode, it must be baked before use to remove moisture. According to the provisions of the electrode manufacturer’s specification, low-hydrogen welding of low carbon steel and ordinary low-alloy steel, “to be 800 ~ 350 ℃ baking 1 hour”; welding 60 kg high-strength steel and above for low hydrogen electrode, 850 ~ 400 ℃ baking 1 ~ 2 hours. " The implication of this requirement is that the electrode is heated to 300 to 350 ° C and 350 to 400 ° C and then maintained at this temperature for 1 to 2 hours. Its purpose is to make the electrode coating of crystal water, moisture and other sufficient escape, the electrode dry.