Definition
Visible weld features do not conform to the requirements of the applicable
standard.
Same as: Poor class I appearance, poor cosmetic weld appearance.
Description
Spot welds are typically classified both in terms of their functional
requirements and their surface appearance. The most stringent cosmetic
stipulation is for the appearance of a surface (usually customer-visible)
to be free from markings or imperfections such that a weld is not visible
after painting. Other requirements may limit the displacement, indentation,
or distortion of the parent metal. These criteria are normally specified
as a percentage of the governing metal thickness. Weld flash may also
be specified as unacceptable.
Detection
Detection is normally by visual inspection of the weld surface. Measurements
may be required on marginal indentation or displacement calls.
Significance
Quality, Workplace Issues, Cost, Downtime, Maintenance, Throughput (cycle
time; PPH), are all potentially affected by this condition. Special
considerations are noted below:
Quality: Welds not satisfying the appearance
requirement may adversely affect the function of seals, fit of trim,
customer quality perception etc.
Possible Causes
Strong Possibilities
Weak Possibilities
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