I have written about this earlier but when I
was in the engineering school, taking my first, I would call them technical
courses, I was a bit terrified of the possible mistake I could do and mess up
the whole production line mid-through the course. This fear later on went away.
I don’t know how but maybe I didn't pay enough attention to the courses and
failed a few! I really don’t remember and it doesn't matter now.
Then starting work in the industry, I soon
realized that most of the nonsense we studies in those years were only theory.
No one, literally no one ever or barely utilizes them in the work and they were
only good to pass hours in the classroom, pass the examinations and get the
damn bachelor’s degree. Of course high-tech industry uses them but how many
companies we have around the world and how many educated people we have in
those companies who are really in to that.
With that in mind I was reading the newly
issued CSA Standard W59-13, that part about preheating of weld. This section
has a big table (called Table 5.3) which tells you for what welding process and
what thickness of base metal, what the pre-heat temperature should be.
For instance if you have between 20 and 40 mm
of thickness using SMAW process and your consumables of Hydrogen Designation of
less than H4, you need to apply 50° C heat prior to commence welding. This
temperature should remain the same during the course welding, when the base
metal is below the temperature listed the surface of the parts on which the
weld metal is being deposited are at or above the minimum stated temperature
for distance equal to the thickness of the thickness of the part being welded
but not less than 75 mm, both laterally and in advance of welding.
This more sounds like a stupid joke to me
that if I told, no one would laugh at it. First of all who is going to check
that temperature? The welder wouldn't do it because all he or rarely she wants
to do is to finish the damn weld and get to his favorite bar for his beer.
Welding inspector for sure wouldn’t do it. Welding inspectors are mostly a damn
fool who wait until the welding is finished and then start their inspection!
Unlike what is said that quality control should be proactive, not reactive, the
majority of quality control actions are reactive in the industry. How about the
welding supervisor? He is probably busy somewhere in a filthy office by the
phone and even if he was not and really wanted to check the temperature, how
would he do it? Does he have a thermometer on him?! Never!
Even theoretically an inspection package
available in the market for the inspectors does not contain a thermometer of
any kind. So this is another reason as why most of the things we read in the
standards, textbooks and specifications are all silly nonsense! I have a few
photos of popular weld inspection sets for welding. None of them includes a
thermometer of any kind. I guess I made my point.
(Photo: A modern Welding Inspection Kit comprises of different tools but no thermometer of any kind. I have a gauge given to me by The Cheapskate, never used it so far unless for practice)
No comments:
Post a Comment