带柄工具(如缵头,立铣刀等)通常都由贵重的商速鋼和较便宜的中碳鋼或低合金鋼(45号或40X鋼)对焊而成。直到目前为止,对於焊接工具的热处理,仍有两种说法:其一,主张淬火加热时,临面不应超过焊缝;卽焊缝应在临面以上1O～12公厘。其二,主张临面应超过焊缝。前者的理由是,当临面超过焊缝时,则工具刃部及高速鋼靠近焊缝处均淬火成麻屯顿赛体,硬度达到60 Rc以上,并产生极大的相变应力。而在中碳鋼部份由於在油中冷却或採用分极淬火(视高速鋼 Shank tools (such as stirrups, end mills, etc.) are usually butt welded from expensive, quick-acting steel and cheaper medium or low-alloy steels (45 or 40X). Until now, there are still two versions of the heat treatment of welding tools: first, the addendum should not exceed the weld surface when quenching and heating; 卽 weld seam should be 1O ~ 12 mm above the surface. Second, the proposal should be more than the weld seam. The former reason is that when the face beyond the weld, the tool edge and high-speed steel near the weld are quenched into Ma Tunun Ti body, the hardness of 60 Rc above, and produce great phase transformation stress. In the part of the carbon steel due to cooling in the oil or the use of polarization quenching (as high-speed steel