"The seam weld may have been the technical reason, but this was an organizational accident."

In this model, the skirt of the wheel center is connected to the rim by four seam weld lengths.

Investigators have identified a flawed seam weld on the line as the starting point of the deadly rupture.

The mechanic was under the Bolo finishing up a seam weld with a laser pistol.

The perfect clamp for pulling parallel seam welds.

Depth seam welds gives maximum strength.

High quality, low ageing Metal Seam Weld package.

All our fuel tanks are made from Stainless Steel using a single sheet with a seam weld and then end capped.

Ribcraft fuel tanks are made from a single piece of rolled Marine grade stainless steel and a single seam weld with two end caps.

Examples include the overlapping dials on the instrument cluster, and the offset petrol filler which allowed for a clean continuous seam weld on the tank.

Support each section on bearers and push the second section on to the base section ensuring that the octagonal sides and seam welds are aligned.

At various stations a number of final spot and seam welds are made, and then power grinders are used to smooth down exposed welds and any high spots.

The NTSB's recommendations follows a disclosure by federal accident investigators last month that the ruptured segment of the gas pipeline had a weld along its spine known as a seam weld.

The metallurgical report released Friday by federal transportation safety officials identified for the first time a particular seam weld as the cause of the rupture in the Sept. 9, 2010, explosion, the San Francisco Chronicle reported.

In the case of spot, projection and most seam welds, the time interval from the instant current starts to flow, to the instant the forging force is released after current ceases, is measured in cycles.

Pipeline safety experts said it was concerning that PG&E lacked key details about weld flaws on the ruptured line, because girth weld and long seam weld leaks necessitate different kinds of safety tests.