Spot welding (RSW)[1] is a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current flow. Work-pieces are held together under pressure exerted by electrodes. Typically the sheets are in the 0.5 to 3 mm (0.020 to 0.12 in) thickness range. The process uses two shaped copper alloy electrodes to concentrate welding current into a small "spot" and to simultaneously clamp the sheets together. Forcing a large current through the spot will melt the metal and form the weld. The attractive feature of spot welding is a lot of energy can be delivered to the spot in a very short time (approximately ten milliseconds).[2] That permits the welding to occur without excessive heating to the rest of the sheet.

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Applications


Perhaps the most common application of spot welding is in the automobile manufacturing industry, where it is used almost universally to weld the sheet metal to form a car. Spot welders can also be completely automated, and many of the industrial robots found on assembly lines are spot welders (the other major use for robots being painting).

erm, if not mistaken, prtn already used one piece door stamping gen2, tailor welded blanks door saga,exora, and preve i think, door sash + doorpanel,  using double spot, robotic plasma welding.

I thinkla :-), dengor2 khabar anginla, ingress corp supply the door to prtn preve. So, better ask them lah, ha...ha...

The door sash is made using roll forming method, only using this method, u can used advance high strength steel(ahss) aka ultra high tensile steel(uhss) as the material coz in cold forming method, its really hard to shape ahss to complex shape coz of its rigidity.

Then the door structure is normally used high strength steel low alloy(hsla), and the trapezoidal impact beam, unique to proton n lotus, start in satria neo n upward(not tabular impact beam as some others using) inside the door also ahss using roll forming.

So, combining the door sash n door panel is using robotic(not human, unless humanoid :-)) plasma welding, double spot, for strength n better corrosion resistant. Ops, forget to mentioned, all high strength steel using in car are galvanised steel(corrosion resistant coating steel). Plus, its now painted in white(thats why they called it body in white as the preve chasis during power of one event), then another layers of colors paint.

So, in other words, using this method, the door will enhance its strength by combining two type of steels(ahss for door sash n hsla for door structure), n door sash is stronger than before as in using tailor welded blanks. Coz previously, only being protected by ahss impact beam inside the door, but door sash still not as strong as ahss(trip or dp), but now, the whole door has the same strength. Yup, i think better they (prtn)conceal with rubber next time, so that people will not do their own professional analysis.

Malas betul nk taip panjang2 dlm hp, dont ask me again about this coz juz copy the word from some fella fren :-). Further info, maybe u can contact the above mentioned kot :-).

130kmh, pull to S mode, possible of course, the impossible for .....to catch u.

Cvt, ask kristof ler. Or maybe u just visit autoworld to understand better, wet clutch cvt. The suggestion method, to overcome throttle lag from dbw, put in s mode, to overcome torque retention by cvt,before century sprint, when u waiting at junction, dont used footbrake(meaning car already stop, but its normal u still pressing the brake especially at steep road), used handbrake instead, ur right foot already at the gas pedal,
when everything clear, then lift the handbrake and press the pedal :-).

Wah, mcm pemberita sukan plak. If want to know why this n there in wet clutch cvt, n how it is differ from torque converter or dry clutch cvt, then refer to kristof, he's the expert. Me just a layman explanation, already explain about clutch, many didnt understand, then refer to him, he can answer u, deeply.

Sorry fenomx, my children are sick, so, bz taking care of them after work.

Aahhh., children just sleeping. Me, already tired . Salam.