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October 16 - October 22, 2016

How do you properly coat welded joints?

Selected Answers

From Per Gabrielsson of Free Lance Consultations and Inspections on October 19, 2016:
To apply the stripe coat on welds and edges, the ideal would be to do that before the first spray application. Take, for instance, scallops and other edge steel.  If  you are spraying before striping, the stripe coat will be applied on top of partially loose spray dust. Thus, if the contractor is afraid to lose the blast due to extensive stripe coating, perform a limited stripe coating.

From Eric Williams of Fought & Co. Inc. on October 18, 2016:
SSPC standards allow for the stripe-coat application prior to or after initial application. Dependent on the project specifications, the stripe coat is considered an independent coat. With catalyzed coating materials, coat times must be observed. SSPC's Good Painting Practice suggests that weld should be ground smooth for good coating performance.

From Per Gabrielsson of Free Lance Consultations and Inspections on October 18, 2016:
There is only one solution, especially for manually welded joints. Use a moderately stiff, good-quality ROUND brush and work well into the surface. Do not try to build up heavy thickness. In practice, flat brushes are mostly used in a way comparable to putting butter on bread. The use of roller for striping welds should be completely banned by paint manufacturers and societies because with this tool the paint is only slashed onto the surface.

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Tagged categories: Asia Pacific; Coatings; EMEA (Europe, Middle East and Africa); Field joint coatings; Girth welds; Latin America; North America; Welding

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