PCT No. PCT/FI86/00086 Sec. 371 Date May 15, 1987 Sec. 102(e) Date May 15, 1987 PCT Filed Jul. 23, 1986 PCT Pub. No. WO87/00471 PCT Pub. Date Jan. 29, 1987.A pastelike additive used in the underwater arc welding to protect the weld and/or welding rod against the harmful effects of water. The additive contains the base material advantageously mixed with oily carrier liquid and comprising at least 10 percentages of weight one base material, advantageously a biomass with plenty of organic compounds, and possibly termitic agent, regulating agent for the pH-value of the additive, lighting agent, hydrogen removal agent and an agent to enhance the sufficiency. The additive according to the invention is characterized in that the ashless dry material of the biomass in the base material contains: 1 . . . 40, advantageously 10 . . . 13, percentages of weight amino acids; 0,5 . . . 10, advantageously 1,5 . . . 2,5, percentages of weight fatty acids; 50 . . . 98, advantageously 83 . . . 87, percentages of weight carbohydrates, preferably carbon compounds with large molecular sizes; and about 0,5 percentages of weight mineral substances and/or trace elements.
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