unstable frame

Welding seam image of Buick automobile auxiliary frame is very unstable.

别克副车架人工焊接的焊缝图像除具有一般焊缝图像的特点外，还具有极大的不稳定性，其主要原因在于人工焊接的不规则和CCD获取图像的不稳定。

This inevitably lead to mang disadvantageous factors, such as fallacious frame of the mould, unstable cast quality, longer period of mould design and higher cost, etc.

这就不可避免地造成模具结构不合理、铸件质量不稳定、铸造模具的设计周期长、成本高等不利因素，有时甚至出现因事前设计考虑不周，导致原设计方案推倒重来的现象。

The stress in primary support is very large especially in profiled bar steel frame, the inner and outside edge of steel frame are in stress condition and most steel frame stresses exceed steel yield limit, the steel stress in unstable condition;

初期支护受力很大，特别是钢架内、外缘均处于受压状态，而且钢架大部分均超过钢材的屈服极限，钢架处于失稳状态；