【摘要】 作为压力容器常用的50公斤级13MnNiMoNbR钢,当采用与其匹配的J707焊条时,需要预热来防止焊接裂缝。采用强度低、塑性较好的J507RH低氢焊条和J707焊条对50mm厚的13MnNiMoNbR正火+回火钢板进行了铁研式和窗型拘束裂缝试验。试验表明,当采用低强度高韧性焊条时,防止根部裂缝所需预热温度可降低50℃左右。并通过不同坡口尺寸的接头拉伸试验,对低匹配焊接接头的强度与焊缝在厚度方向的平均宽度和板厚的比值进行了研究。对低匹配接头在容器制造中的具体运用作了叙述和图示。更多还原

【Abstract】 As a50-kilograme-grade13MnNiMoNbR steel usually used in pressure vesse l manufacturing,it need to prevent weld ing crack when J707electrode is use d to match this kind of steel.Either J707or the low-strength and super-pla sticity J507RH less Hydrogen electrodes is used to make Y-groove cracking te st and Window-shape restrictive cracking test for50mm-thick13MnNiMoNbR nor malized add tempered steel plate.The test indicats that when using low-strengt h and high-toughness welding electrode,the needed preheat temperature that is used to avoid root crack can be reduced about 50℃.By tension test with diff erent size groove of joint,we have studied the ratio of the strength of less-matched weld joint with the average width at the weld thickness progression and the plates thickness.It also gives the description and illustration for the application of less-matched joint in the vessel manufacturing.更多还原