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Vauxhall/Opels are on a par with other German cars with regard to structural strength (unlike Fords!), and usually get 5 stars in EuroNCAP crash tests.
Interesting to see you don't rate the body integrity of Henry's finest?
From someone that works in body Construction in a Ford derived plant that uses Ford designed Underbodies (and a multitude of other BIW parts) as bases for its product, I can tell you that this comment confuses me somewhat!
Are you talking about products of old?
Nope. Even the latest Fords are no match for Vauxhall/Opel, Renault, VW, and the likes. Ford never quite cut in EuroNCAP tests. OK, they may sometimes hit 5 stars, but the devil is in the detail.
And how may Fords use continuous seam or butt laser welding - none. They still use 1960s spot welding technology.
What about full three-section sills - the most crucial part of the structure. For still don't use a full three section, yet Vauxhall, VW and Audi use four section, and some parts are 5-section sills.
Bottom line though is to ask any "established" Police accident investigator - and Fords will always be at the bottom of their own transport requirements.
Even Volvos are not the "tanks" they once were, before Ford got their grubby mitts on ownership of that well-known "tough" brand.
So the 1300 odd spot welds used on the mk 5 Golf are not counted or invisible then?
Spot (resistance) welding has been around a lot longer than the 60's and most manufacturers still use them, including the ones mentioned in your above post.
I could post up various links to videos of spot welders in current action at various car plants across the world.
Re: Laser welding, this is used to some degree on long runs that are easily accessible for the robot heads for instance the roof seams, and does away with the need to seal up the joints with Terostat or the like afterwards due to the 100% integrity.
Laser welding is also used to save wastage on sheet metal , for example the door skin inners in the plant where I work are made in 2 pieces and joined with laser welding, wheras otherwise there would be a lot of wasted raw material if they were pressed out in one piece. Of course Aluminium shells still have to be laser welded (or increasingly bonded) as spot welding doesn't work.
I work closely with a guy at work who is an ABB employee, he is a seasoned traveller to BIW plants around the world, and guess what he is a specialist in? yep ABB resistance welding robots.
The strength of a bodyshell is not totally reliant on the sill section anymore, any modern floorpan will have reinforcing running lengthways along the x axis, (usually the underbody and door opening panel - DOP) and tied up with specific re-inforcing panels to spread the load of any impact (deformation) as you know cars are designed to absorb impact and spread the force of throughout the body, so multi-skinned sill sections, although once necessary, aren't used to such an extent anymore. Manufacturers do things in different ways thats all!