奧氏體304不銹鋼鋼管A-TIG焊接工藝研究
Reasearch on A-TIG Welding Process for 304 Austenitic Stainless Steel Pipe
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摘要: 以Φ45 mm×8 mm規(guī)格奧氏體304不銹鋼鋼管為研究對(duì)象，采用A-TIG焊（添加活性劑的鎢極氬弧焊）進(jìn)行對(duì)接焊接工藝試驗(yàn)，研究不同焊接起始點(diǎn)對(duì)焊縫成型的影響，并檢測(cè)外觀質(zhì)量符合要求的焊件的性能和微觀組織等。分析認(rèn)為：采用A-TIG焊接工藝焊接Φ45 mm×8 mm規(guī)格奧氏體304不銹鋼鋼管時(shí)，可在不開坡口、不填絲的情況下，實(shí)現(xiàn)一次性焊透，并達(dá)到單面焊雙面成型的目的；焊縫組織為奧氏體+鐵素體，其組織與未添加活性劑時(shí)的一致，但添加活性劑可明顯改善組織性能；焊接接頭的性能滿足標(biāo)準(zhǔn)要求。Abstract: Taking the Φ45 mm×8 mm austenitic 304 stainless steel pipe as the subject of study，the butt welding process applying A-TIG welding technology（argon tungsten arc welding with activating flux）is tested.The effects of different welding starting points on the formation of welds are studied，and the performances and microstructures of welding parts with satisfied appearance quality are tested.The analysis result shows that when A-TIG welding technology is applied on the Φ45 mm×8 mm austenitic 304 stainless steel pipe，the full welding penetration at one time and the double-sided formation by single-side welding are realized without bevelling or using of filler wire.The weld is of austenitic+ferritic structure，and although it is consistent with that of the weld when no activating flux being used，the adding of activating flux is able to significantly improve the structure performances.The perfomances of the weld joint is in compliance with applicable standard.
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