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    目前国家将焊接高强度钢的主要钢种牌号已纳入GB／T1591—94中。焊接高强度钢的合金设计，放在第一位考虑的是钢的强度，强化机制包括固溶强化、析出强化、细晶强化、位错及亚结构强化以及相变的组织强化。此5种强化机制的组合，可以生产出屈服强度由295～880MPa不同级别的焊接高强度钢，以及不同强度和韧性的强韧钢等级。
当防护栏片焊接好以后,就要想办法去消除焊接残余应力,通常我们可以采用以下三种方示:热处理、锤击、振动法和加载法等。
1、我们会对防护栏片进行热处理热处理包括整体高温回火和局部回火。消除残余应力的效果主要取决于焊件整体或局部加热温度、焊件的成分和组织、保温时间长短、冷却速度以及焊后焊件的状态等。对于同一种材料，回火温度越高，保温时间越长，残余应力越小。采用整体回火效果好于局部回火。对于某些残余应力较小不允许或不可能进行整体回火的焊件，可采用局部回火。
2、也可以进行锤击消除法。在电焊网片焊后采用带小圆头面的手锤锤击焊缝及近缝区，使焊缝及近缝区的金属得到延展变形，用来补偿或抵消焊接时所产生的压缩塑性变形，使焊接残余应力降低。锤击时要掌握好打击力量，保持均匀、适度，避免因打击力量过大造成加工硬化或将焊缝锤裂。另外，焊后要及时锤击，除打底层不宜采用锤击外，其余焊完每一层或每一道都要进行锤击。
3、最简单就是振动消除法。振动消除法是利用由偏心轮和变速马达组成的激振器，使焊接结构发生共振所产生的循环应力来降低内应力的。 如截面为30mm×50mm一侧堆焊的试件，经过σmax＝128N/mm2和σmin＝5.6N/mm2多次应力循环后，残余应力的变化情况。

   At present the country to the welding of high strength steel major steel grades have been included in GB/T1591-94. Welding of high strength steel alloy design, as the first consideration is the strength of the steel, strengthen the mechanism including solid solution strengthening, precipitation strengthening, fine grain strengthening, dislocation and substructure strengthening and phase transformation of the organization. The five kinds of strengthening mechanism of the combination, can produce the yield strength of 295 ~ 880 mpa welding high strength steel of different levels, and different matching strong strength and toughness of steel grade.
When the fence after welding, will be to find ways to eliminate the welding residual stress, usually we can use the following three: heat treatment, peening, vibration method and load method, etc.
   1, we will fence pieces for heat treatment including the overall high temperature tempering and local tempering heat treatment. To eliminate residual stress depends mainly on the effect of welding pieces of whole or partial heating temperature, the composition and organization of the weldment, length of time of heat preservation, cooling speed and welding parts after welding state, etc. For the same kind of material, the higher the tempering temperature, the longer the holding time, the smaller residual stress. Adopt entire temper better than local tempering. For some smaller residual stress does not allow, or could not have tempered the whole weldment, can use local tempering.
    2, also can undertake hammer elimination method. In welded wire mesh adopts after welding with a small round head near and hammer hammer weld seam area, near and make the weld seam zone m e t al stretching deformation, used to compensate or offset the compressive plastic deformation generated during welding, the welding residual stress is reduced. Hammer to master good forces, maintain uniform, appropriate, avoid to work hardening caused by the force is too large or the hammer of the welding crack. In addition, after welding to hammer in time, in addition to the play ground floor unfavorable use hammer, the rest of the welding after each to each layer or a hammer.
    3, the most simple is vibration elimination method. Vibration elimination method is to use the vibrator made up of eccentric and a variable speed motor, the cyclic stress produced by welding structure resonance occur to reduce internal stress. Such as the cross section of 30 mm x 50 mm side welding specimen, and sigma Max = 128 N/was sigma min = 5.6 N/was many times after the stress cycle, the change of residual stress.
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