SKD 61 (H13) 是高合金鋼, 隨隨便便就焊鉄塊上去, 上機試模, 當然是一鍛就破. (cracked on one stroke). H13 is a high alloy tool steel. It can not be welded without any preheating. Otherwise, it will crack like this.
輻射中心是裂源=焊道下方. Crack emanating from beneath weldment.
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