Special pattern was used to weld core iron to guarantee position accuracy of cast holes;

采用专用胎具焊接芯骨以保证铸孔的位置精度；

youdao

Special pattern was used to weld core iron to guarantee position accuracy of cast holes;

采用专用胎具焊接芯骨以保证铸孔的位置精度；

youdao