求翻译：对由冲击试验所得的各试样冲击韧性值进行对比可以发现，经焊前预热焊接工艺或是经焊后保温焊接工艺或是经先预热再保温焊接工艺处理后的试件的焊缝区冲击韧性要好于经直接焊接焊接工艺处理的试件的焊缝区冲击韧性。是什么意思？

Comparison sample obtained by the impact test impact toughness can be found by preheating before welding process the welding process or by welding, insulation, or by the first warm-up, re-insulation specimen of the weld after the welding process handling District impact toughness is better than by d

Proceeds from the shock of the impact toughness values for samples can be found in the warm-up, welding or soldering process is kept warm by the welding welding process or after the first warm-up and then keep warm soldering process of the test specimen of the weld zone impact toughness is much bett

To carries on the contrast by the impact test obtained various test specimens resilient value to be possible to discover front that, after welds the preheating welding craft perhaps after welds keeps warm the welding craft perhaps after preheating again keeps warm the welding craft processing test s

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