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奥氏体不锈钢的焊接技术注意点
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奥氏体不锈钢的焊接技术注意点

作者:金刚网 更新时间:2018-12-12 15:36 点击数:

奥氏体不锈钢的焊接技术注意点 
应该注意的问题有:
(1)焊前预热及焊后热处理的选择只有在采用同质焊接材料焊接较高vC+Nw含量的高烙铁素体不锈钢母材的情况下才有低温预热的必要性,高纯度的铁素体不锈钢可以不预热。 

(2)焊接材料选择。一般来说,采用奥氏体焊接材料。才能保证焊缝具有较高的韧性;如果要求焊缝的颜色与母材颜色相同或接近,则可采用专门的铁素体焊接材料。 
(3)475℃脆化问题。475℃脆性是铁素体不锈钢不可回避的主要问题之一。为了减小475℃脆性,无论是母材还是焊缝金属都应该是最大限度的提高纯度,并尽量避开430-485℃之间的加热,或者尽量缩短在此温度区间的停留时间。 

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Attention Points in Welding Technology of Austenitic Stainless Steel
The following points should be noted:
(1) The selection of preheating before welding and post-welding heat treatment is necessary only when homogeneous welding materials are used to weld high vC+Nw content high soldering ferritic stainless steel base material. High purity ferritic stainless steel can not be preheated.
(2) Selection of welding materials. Generally speaking, austenitic welding material is used. Only in this way can high toughness be ensured; if the color of the weld is required to be the same or close to that of the base metal, special ferrite welding material can be used.
(3) embrittlement at 475 C. Brittleness at 475 (?) C is one of the main problems of ferritic stainless steel. In order to reduce the brittleness of 475 C, both base metal and weld metal should maximize the purity, avoid heating between 430 and 485 C, or shorten the residence time in this temperature range as far as possible.

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