Weld-seam position and thickness difference do not affect stress and strain states.
焊缝位置和壁厚差异变化时，拼焊管各区域的应力状态保持不变。
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；
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；
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