A method of resistance welding a first faying surface (341, 342) of a first composite article (10, 210, 310) to a second faying surface (351, 352) of a second composite article (12, 212, 312), wherein one or both of the faying surfaces comprises a meltable or softenable material; the method comprising: contacting the first and second faying surfaces to define a contact area (340, 350) therebetween; providing a conductive element (20, 120, 220, 3201, 3202) between the faying surfaces along a length of the contact area; the conductive element comprising a plurality of lower resistivity electrode portions (24a, 24b, 124a-124d, 3241, 3241a, 3241b, 3242, 3242a, 3242b) spaced apart along the length of the contact area; wherein each electrode portion extends across a respective width of the contact area and each end thereof comprising an electrode (28, 28a, 28b, 128a-128d, 228a-228d, 227, 3281ai, 3281bi, 3281ao, 3281bo, 3282ai, 3282bi, 3282ao, 3282bo) extending from the contact area; applying an electrical current between the electrodes (28a, 128a, 228a, 3281ai, 3281ao, 3282ai, 3282ao) of a first said electrode portion (24, 124a, 3241a, 3242a) to raise the temperature of the meltable or softenable material and weld together a portion of the faying surfaces between the electrodes of the first electrode portion; applying an electrical current between the electrodes (28b, 128b, 228b, 3281bi, 3281bo, 3282bi, 3282bo) of a second said electrode portion (24b, 124b, 3241b, 3242b) to raise the temperature of the meltable or softenable material and weld together a portion of the faying surfaces between the electrodes of the second electrode portion; and applying an electrical current between electrodes of the first and second electrode portions to raise the temperature of the meltable or softenable material and weld together a portion of the faying surfaces of the first and second electrode portions. contacting the first and second faying surfaces to define a contact area (340, 350) therebetween; providing a conductive element (20, 120, 220, 3201, 3202) between the faying surfaces along a length of the contact area; the conductive element comprising a plurality of lower resistivity electrode portions (24a, 24b, 124a-124d, 3241, 3241a, 3241b, 3242, 3242a, 3242b) spaced apart along the length of the contact area; wherein each electrode portion extends across a respective width of the contact area and each end thereof comprising an electrode (28, 28a, 28b, 128a-128d, 228a-228d, 227, 3281ai, 3281bi, 3281ao, 3281bo, 3282ai, 3282bi, 3282ao, 3282bo) extending from the contact area; applying an electrical current between the electrodes (28a, 128a, 228a, 3281ai, 3281ao, 3282ai, 3282ao) of a first said electrode portion (24, 124a, 3241a, 3242a) to raise the temperature of the meltable or softenable material and weld together a portion of the faying surfaces between the electrodes of the first electrode portion; applying an electrical current between the electrodes (28b, 128b, 228b, 3281bi, 3281bo, 3282bi, 3282bo) of a second said electrode portion (24b, 124b, 3241b, 3242b) to raise the temperature of the meltable or softenable material and weld together a portion of the faying surfaces between the electrodes of the second electrode portion; and applying an electrical current between electrodes of the first and second electrode portions to raise the temperature of the meltable or softenable material and weld together a portion of the faying surfaces of the first and second electrode portions.