X70鋼級大壁厚HFW鋼管接觸焊接工藝研究

Study on Contact-welding Process for X70 Heavy-wall HFW Pipe

摘要: 研究X70鋼級Φ508 mm×17.5 mm規(guī)格高頻焊管接觸焊工藝，并檢測高頻接觸焊鋼管焊縫的性能，分析高頻接觸焊接工藝電極觸腳在管體產生的劃痕。試驗結果表明，采用高頻接觸焊接工藝進行焊接，HFW鋼管焊縫的各項性能指標均達到GB/T 9711—2017標準PSL2等級要求，說明采用高頻接觸焊接工藝可以制造性能良好的HFW鋼管；電極觸腳在管體表面產生的劃痕并不影響鋼管性能；高頻接觸焊接工藝的電能損耗是同等條件下高頻感應焊接工藝的55%。

Abstract: Studied in the article is the contact-welding process for the Φ508 mm×17.5 mm HFW pipe.The performance of the weld of the said HFW pipe is tested.And the scratch mark on the pipe surface as caused by the HFW electrode tips is investigated.The testing result indicates that thanks to the HF contact welding, all the performance indexes of the weld of the said pipe are in compliance with relevant requirements as specified in GB/T 9711—2017 PSL2, which means that it is practical to adopt the said HF contact-welding process to produce excellent HFW pipes.The scratch marks as made by the electrode tips on the pipe surface will not produce any negative influence on the pipe performance.Moreover given relevant conditions are the same, the power consumption by the HF contact-welding process is just 55%of that by the HF induction welding process.