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首页> 外文期刊>Science and Technology of Welding and Joining >Influence of pre- and post-weld heating on weldability of modified 9Cr-lMo(V-Nb)steel pipe under shielded metal arc and tungsten inert gas welding processes
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Influence of pre- and post-weld heating on weldability of modified 9Cr-lMo(V-Nb)steel pipe under shielded metal arc and tungsten inert gas welding processes

机译：焊前和焊后加热对9Cr-lMo（V-Nb）改性钢管在屏蔽金属电弧焊和钨极惰性气体保护焊接工艺中的焊接性能的影响

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Welding of modified 9Cr-lMo(V-Nb) steel pipes hasbeen carried out via shielded metal arc (SMA) andtungsten inert gas (TIG) welding processes. The weldjoints have been produced using different preheatingtemperatures, followed by post-weld heat treatment(PWHT) at various temperatures. The microstruc-tures of the weld and of the heat affected zone (HAZ)of the weld joints have been studied under the opticalmicroscope and correlated with the preheating andPWHT. The average hardness of the weld anddifferent regions of the HAZ, and tensile propertiesof the weld joints have also been studied and correlatedwith the preheating and PWHT. The tensile propertiesof the SMA and TIG weld joints produced usingpreheating and PWHT at various temperatures arecompared and correlated with their micro structures. Itis noted that a comparatively high preheating temperature of the order of 573 K is beneficial, andPWHT is necessary to reduce the susceptibility to coldcracking of weld joints of the present steel. The PWHTat 1123 K enhances utility to fracture, but decreasesthe tensile strength of the base material, causingfrafture of both the SMA and TIG weld joints fromthis region close to the HAZ. The tensile properties ofSMA welds are found to be superior to those of theTIG welds, especially for PWHT at temperatures up to1023 K.
机译：已经通过屏蔽金属电弧焊（SMA）和钨极惰性气体（TIG）焊接工艺进行了9Cr-1Mo（V-Nb）改性钢管的焊接。使用不同的预热温度生产焊接接头，然后在各种温度下进行焊后热处理（PWHT）。在光学显微镜下研究了焊缝和焊缝热影响区（HAZ）的微观结构，并将其与预热和PWHT相关联。还研究了热影响区焊缝和不同区域的平均硬度以及焊缝的拉伸性能，并将其与预热和PWHT相关联。比较了在不同温度下使用预热和PWHT生产的SMA和TIG焊接接头的拉伸性能，并将其与其微观结构相关联。注意到，相对高的约573K的预热温度是有利的，并且PWHT对于降低本发明的钢的焊接接头的冷裂敏感性是必要的。 PWHTat 1123 K增强了断裂的效用，但降低了基体材料的拉伸强度，从而导致从靠近热影响区的该区域的SMA和TIG焊接接头断裂。发现SMA焊缝的拉伸性能优于TIG焊缝，尤其是在温度高达1023 K的PWHT情况下。

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