Adds the experimental welder to R&D + adds some descriptions.

code/game/objects/items/weapons/tools.dm

@@ -144,6 +144,7 @@
  */
 /obj/item/weapon/weldingtool
 	name = "welding tool"
+	desc = "A standard edition welder provided by NanoTrasen."
 	icon = 'icons/obj/items.dmi'
 	icon_state = "welder"
 	item_state = "welder"
@@ -368,6 +369,7 @@
 
 /obj/item/weapon/weldingtool/largetank
 	name = "industrial welding tool"
+	desc = "A slightly larger welder with a larger tank."
 	icon_state = "indwelder"
 	max_fuel = 40
 	g_amt = 60
@@ -381,6 +383,7 @@
 
 /obj/item/weapon/weldingtool/mini
 	name = "emergency welding tool"
+	desc = "A miniature welder used during emergencies."
 	icon_state = "miniwelder"
 	max_fuel = 10
 	w_class = 1
@@ -394,6 +397,7 @@
 
 /obj/item/weapon/weldingtool/hugetank
 	name = "upgraded industrial welding tool"
+	desc = "An upgraded welder based of the industrial welder."
 	icon_state = "upindwelder"
 	item_state = "upindwelder"
 	max_fuel = 80
@@ -403,13 +407,15 @@
 
 /obj/item/weapon/weldingtool/experimental
 	name = "experimental welding tool"
+	desc = "An experimental welder capable of self-fuel generation."
 	icon_state = "exwelder"
 	item_state = "exwelder"
 	max_fuel = 40
 	m_amt = 70
 	g_amt = 120
-	origin_tech = "engineering=4;plasmatech=3"
+	origin_tech = "materials=4;engineering=4;bluespace=3;plasmatech=3"
 	var/last_gen = 0
+	change_icons = 0
 
 
 //Proc to make the experimental welder generate fuel, optimized as fuck -Sieve

code/modules/research/designs.dm

@@ -392,3 +392,17 @@ datum/design/proc/CalcReliability(var/list/temp_techs)
 	materials = list("$metal" = 2000, "$glass" = 1000)
 	build_path = /obj/item/weapon/holosign_creator
 	category = list("Equipment")
+
+/////////////////////////////////////////
+////////////Tools//////////////
+/////////////////////////////////////////
+
+/datum/design/exwelder
+	name = "Experimental Welding Tool"
+	desc = "An experimental welder capable of self-fuel generation."
+	id = "exwelder"
+	req_tech = list("materials" = 4, "engineering" = 4, "bluespace" = 3, "plasmatech" = 3)
+	build_type = PROTOLATHE
+	materials = list("$metal" = 1000, "$glass" = 500, "$plasma" = 1500, "$uranium" = 200)
+	build_path = /obj/item/weapon/weldingtool/experimental
+	category = list("Equipment")