invisible fly screen mesh

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  • The two spines are 7 to 8 circles in the middle, while the ordinary spines are only 3 and a half circles, showing neat and beautiful. Now domestic customers see the positive and negative twisting rope, the impression is that the silk is too thin, can not play a protective role, in fact, it is not.
  • Deoxygenation of boiling steel is incomplete, oxygen content is high, phosphorus and other impurities distribution is uneven, local overspending, aging sensitivity and cold brittle sensitivity are high, hot cracking tendency is added. If unqualified electrode is used, if the content of carbon and sulfur in the weld metal is too high, cracks will occur. For example, when factories use acidic electrodes to weld Q235-A steel, the high carbon fernoganese in the electrode coating will lead to thermal cracks in the weld.
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