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- To: "SEAOC List Serve" <seaint(--nospam--at)seaint.org>
- Subject: Base Metal Preparation
- From: "Brent Koch" <Brent(--nospam--at)willislivermore.com>
- Date: Mon, 26 Jul 1999 17:00:24 -0700
I am interested in List opinions regarding the need to grind the zinc coating off of galvanized metals prior to welding. The following text is from an e-mail message I sent to the Senior Staff Engineer with AWS. ---------------------------------------------------------- Dear Mr. Campbell: My name is Brent Koch. I am a project engineer and a project manager with Willis Construction Company, an archictural precast and GRFC cladding panel manufacturer in California. I have been referred to you by Mark Hildebrand, our chief engineer, for your opinion regarding the need to grind the zinc coating off of galvanized metals prior to welding. As I'm sure you know, galvanized finishes are occasionaly specified for connections of precast cladding panels. I've run across two opposed schools of thought [and two schools of enforcement] regarding the necessity to remove the coating at and around welds. AWS D1.1 Section 3.2.1 says, "Surfaces to be welded, and surfaces adjacent to a weld shall be also be free from loose or thick scale, slag, rust, moisture, grease and other foreign material that would prevent proper welding or produce objectionable fumes." This is the only specification section that I have been able to associate with welding of galvanized metal finishes. Is the galvanizing a foreign material that prevents proper welding and therefore must be removed? (FYI - The welder will be wearing a respirator so the fumes produced will not be 'objectionable' according to his employer.) Thank you in advance for information and insights you can provide on this subject. Sincerely, Brent Koch, P.E Willis Construction Company Brent(--nospam--at)willislivermore.com
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