求翻译：相对于直接焊接焊接工艺而言，按焊前预热焊接工艺焊接的试件其冲击韧性值提高了约46％；按焊后保温焊接工艺焊接的试件其冲击韧性值提高了约45％；按先预热再保温焊接工艺焊接的的试件其冲击韧性值提高了约42％。是什么意思？

Soldered directly to the welding process, according to the specimen preheated before the welding process welding impact toughness improved by about 46%; increased by about 45% according to the post-weld thermal welding process welding specimen of the impact toughness values; The first warm-up insula

As opposed to direct soldering soldering processes, welding welding welding process before the warm-up on the impact toughness value has increased by about 46 per cent after welding welding welding processes keep warm on the impact of tough values increased by approximately 45 per cent; the first wa

Is opposite says in the direct welding welding craft front, according to welded the preheating welding craft welding test sample its resilient value to enhance approximately 46%; After welded keeps warm the welding craft welding test sample its resilient value to enhance approximately 45%; According

For direct welding process, welding, welding preheating before welding process improves the toughness value of welding specimen about 46%; by post weld heat welding technology improves the toughness value of welding specimen about 45%; by preheating before welding technology of thermal insulation im

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